diff --git a/package-lock.json b/package-lock.json
index 081d9b6..142f40a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -332,6 +332,11 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -340,26 +345,25 @@
         "tweetnacl": "^0.14.3"
       }
     },
-    "bindings": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
-      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
-      "requires": {
-        "file-uri-to-path": "1.0.0"
-      }
-    },
     "bl": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/bl/-/bl-3.0.0.tgz",
-      "integrity": "sha512-EUAyP5UHU5hxF8BPT0LKW8gjYLhq1DQIcneOX/pL/m2Alo+OYDQAJlHq+yseMP50Os2nHXOSic6Ss3vSQeyf4A==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
       "requires": {
-        "readable-stream": "^3.0.1"
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
       },
       "dependencies": {
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
+        },
         "readable-stream": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.5.0.tgz",
-          "integrity": "sha512-gSz026xs2LfxBPudDuI41V1lka8cxg64E66SGe78zJlsUofOg/yqwezdIcdfwik6B4h8LFmWPA9ef9X3FiNFLA==",
+          "version": "3.6.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
@@ -367,9 +371,9 @@
           }
         },
         "safe-buffer": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
-          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
         },
         "string_decoder": {
           "version": "1.3.0",
@@ -414,6 +418,15 @@
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
+    "buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "requires": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -485,9 +498,9 @@
       "dev": true
     },
     "chownr": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.3.tgz",
-      "integrity": "sha512-i70fVHhmV3DtTl6nqvZOnIjbY0Pe4kAUjwHj8z0zAdgBtYrJyYwLKCCuRBQ5ppkyL0AkN7HKRnETdmdp1zqNXw=="
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg=="
     },
     "code-point-at": {
       "version": "1.1.0",
@@ -495,12 +508,12 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
     },
     "color": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/color/-/color-3.1.2.tgz",
-      "integrity": "sha512-vXTJhHebByxZn3lDvDJYw4lR5+uB3vuoHsuYA5AKuxRVn5wzzIfQKGLBmgdVRHKTJYeK5rvJcHnrd0Li49CFpg==",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/color/-/color-3.2.1.tgz",
+      "integrity": "sha512-aBl7dZI9ENN6fUGC7mWpMTPNHmWUSNan9tuWN6ahh5ZLNk9baLJOnSMlrQkHcrfFgz2/RigjUVAjdx36VcemKA==",
       "requires": {
-        "color-convert": "^1.9.1",
-        "color-string": "^1.5.2"
+        "color-convert": "^1.9.3",
+        "color-string": "^1.6.0"
       }
     },
     "color-convert": {
@@ -517,9 +530,9 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
     },
     "color-string": {
-      "version": "1.5.3",
-      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.5.3.tgz",
-      "integrity": "sha512-dC2C5qeWoYkxki5UAXapdjqO672AM4vZuPGRQfO8b5HKuKGBbKWpITyDYN7TOFKvRW7kOgAn3746clDBMDJyQw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.6.0.tgz",
+      "integrity": "sha512-c/hGS+kRWJutUBEngKKmk4iH3sD59MBkoxVapS/0wgpCz2u7XsNloxknyvBhzwEs1IbV36D9PwqLPJ2DTu3vMA==",
       "requires": {
         "color-name": "^1.0.0",
         "simple-swizzle": "^0.2.2"
@@ -852,11 +865,6 @@
       "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
       "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw=="
     },
-    "file-uri-to-path": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
-      "integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="
-    },
     "finalhandler": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
@@ -912,17 +920,12 @@
       "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
       "integrity": "sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow=="
     },
-    "fs-copy-file-sync": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/fs-copy-file-sync/-/fs-copy-file-sync-1.1.1.tgz",
-      "integrity": "sha512-2QY5eeqVv4m2PfyMiEuy9adxNP+ajf+8AR05cEi+OAzPcOj90hvFImeZhTmKLBgSd9EvG33jsD7ZRxsx9dThkQ=="
-    },
     "fs-minipass": {
-      "version": "1.2.7",
-      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.7.tgz",
-      "integrity": "sha512-GWSSJGFy4e9GUeCcbIkED+bgAoFyj7XF1mV8rma3QW4NIqX9Kyx79N/PF61H5udOV3aY1IaMLs6pGbH71nlCTA==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-2.1.0.tgz",
+      "integrity": "sha512-V/JgOLFCS+R6Vcq0slCuaeWEdNC3ouDlJMNIsacH2VtALiu9mV4LPrHc5cDl8k5aw6J8jwgWWpiTo5RYhmIzvg==",
       "requires": {
-        "minipass": "^2.6.0"
+        "minipass": "^3.0.0"
       }
     },
     "fs.realpath": {
@@ -1058,6 +1061,11 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
     },
+    "ieee754": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
+      "integrity": "sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA=="
+    },
     "inflight": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
@@ -1074,9 +1082,9 @@
       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
     },
     "ini": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.5.tgz",
-      "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw=="
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
+      "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew=="
     },
     "ip-regex": {
       "version": "2.1.0",
@@ -1258,6 +1266,14 @@
       "integrity": "sha512-gKO5uExCXvSm6zbF562EvM+rd1kQDnB9AZBbiQVzf1ZmdDpxUSvpnAaVOP83N/31mRK8Ml8/VE8DMvsAZQ+7wg==",
       "dev": true
     },
+    "lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "requires": {
+        "yallist": "^4.0.0"
+      }
+    },
     "mathjs": {
       "version": "5.10.3",
       "resolved": "https://registry.npmjs.org/mathjs/-/mathjs-5.10.3.tgz",
@@ -1307,9 +1323,9 @@
       }
     },
     "mimic-response": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-2.0.0.tgz",
-      "integrity": "sha512-8ilDoEapqA4uQ3TwS0jakGONKXVJqpy+RpM+3b7pLdOjghCrEiGp9SRkFbUHAmZW9vdnrENWHjaweIoTIJExSQ=="
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-2.1.0.tgz",
+      "integrity": "sha512-wXqjST+SLt7R009ySCglWBCFpjUygmCIfD790/kVbiGmUgfYGuB14PiTd5DwVxSV4NcYHjzMkoj5LjQZwTQLEA=="
     },
     "minimatch": {
       "version": "3.0.4",
@@ -1326,20 +1342,20 @@
       "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw=="
     },
     "minipass": {
-      "version": "2.9.0",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.9.0.tgz",
-      "integrity": "sha512-wxfUjg9WebH+CUDX/CdbRlh5SmfZiy/hpkxaRI16Y9W56Pa75sWgd/rvFilSgrauD9NyFymP/+JFV3KwzIsJeg==",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.1.3.tgz",
+      "integrity": "sha512-Mgd2GdMVzY+x3IJ+oHnVM+KG3lA5c8tnabyJKmHSaG2kAGpudxuOf8ToDkhumF7UzME7DecbQE9uOZhNm7PuJg==",
       "requires": {
-        "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.0"
+        "yallist": "^4.0.0"
       }
     },
     "minizlib": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-1.3.3.tgz",
-      "integrity": "sha512-6ZYMOEnmVsdCeTJVE0W9ZD+pVnE8h9Hma/iOwwRDsdQoePpoX56/8B6z3P9VNwppJuBKNRuFDRNRqRWexT9G9Q==",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-2.1.2.tgz",
+      "integrity": "sha512-bAxsR8BVfj60DWXHE3u30oHzfl4G7khkSuPW+qvpd7jFRHm7dLxOjUk1EHACJ/hxLY8phGJ0YhYHZo7jil7Qdg==",
       "requires": {
-        "minipass": "^2.9.0"
+        "minipass": "^3.0.0",
+        "yallist": "^4.0.0"
       }
     },
     "mkdirp": {
@@ -1357,6 +1373,11 @@
         }
       }
     },
+    "mkdirp-classic": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz",
+      "integrity": "sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A=="
+    },
     "mocha": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.2.0.tgz",
@@ -1419,14 +1440,14 @@
       }
     },
     "nan": {
-      "version": "2.14.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
-      "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
+      "version": "2.15.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.15.0.tgz",
+      "integrity": "sha512-8ZtvEnA2c5aYCZYd1cvgdnU6cqwixRoYg70xPLWUws5ORTa/lnw+u4amixRS/Ac5U5mQVgp9pnlSUnbNWFaWZQ=="
     },
     "napi-build-utils": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-1.0.1.tgz",
-      "integrity": "sha512-boQj1WFgQH3v4clhu3mTNfP+vOBxorDlE8EKiMjUlLG3C4qAESnn9AxIOkFgTR2c9LtzNjPrjS60cT27ZKBhaA=="
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-1.0.2.tgz",
+      "integrity": "sha512-ONmRUqK7zj7DWX0D9ADe03wbwOBZxNAfF20PlGfCWQcD3+/MakShIHrMqx9YwPTfxDdF1zLeL+RGZiR9kGMLdg=="
     },
     "negotiator": {
       "version": "0.6.2",
@@ -1467,11 +1488,18 @@
       }
     },
     "node-abi": {
-      "version": "2.14.0",
-      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-2.14.0.tgz",
-      "integrity": "sha512-y54KGgEOHnRHlGQi7E5UiryRkH8bmksmQLj/9iLAjoje743YS+KaKB/sDYXgqtT0J16JT3c3AYJZNI98aU/kYg==",
+      "version": "2.30.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-2.30.0.tgz",
+      "integrity": "sha512-g6bZh3YCKQRdwuO/tSZZYJAw622SjsRfJ2X0Iy4sSOHZ34/sPPdVBn8fev2tj7njzLwuqPw9uMtGsGkO5kIQvg==",
       "requires": {
         "semver": "^5.4.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+        }
       }
     },
     "noop-logger": {
@@ -2720,15 +2748,15 @@
       "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
     },
     "prebuild-install": {
-      "version": "5.3.3",
-      "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-5.3.3.tgz",
-      "integrity": "sha512-GV+nsUXuPW2p8Zy7SarF/2W/oiK8bFQgJcncoJ0d7kRpekEA0ftChjfEaF9/Y+QJEc/wFR7RAEa8lYByuUIe2g==",
+      "version": "5.3.6",
+      "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-5.3.6.tgz",
+      "integrity": "sha512-s8Aai8++QQGi4sSbs/M1Qku62PFK49Jm1CbgXklGz4nmHveDq0wzJkg7Na5QbnO1uNH8K7iqx2EQ/mV0MZEmOg==",
       "requires": {
         "detect-libc": "^1.0.3",
         "expand-template": "^2.0.3",
         "github-from-package": "0.0.0",
-        "minimist": "^1.2.0",
-        "mkdirp": "^0.5.1",
+        "minimist": "^1.2.3",
+        "mkdirp-classic": "^0.5.3",
         "napi-build-utils": "^1.0.1",
         "node-abi": "^2.7.0",
         "noop-logger": "^0.1.1",
@@ -2910,9 +2938,12 @@
       "integrity": "sha1-KpsZ4lCoFwmSMaW5mk2vgLf77VQ="
     },
     "semver": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+      "version": "7.3.5",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
+      "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+      "requires": {
+        "lru-cache": "^6.0.0"
+      }
     },
     "send": {
       "version": "0.17.1",
@@ -2963,32 +2994,30 @@
       "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
     },
     "sharp": {
-      "version": "0.21.3",
-      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.21.3.tgz",
-      "integrity": "sha512-5qZk8r+YgfyztLEKkNez20Wynq/Uh1oNyP5T/3gTYwt2lBYGs9iDs5m0yVsZEPm8eVBbAJhS08J1wp/g+Ai1Qw==",
+      "version": "0.24.1",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.24.1.tgz",
+      "integrity": "sha512-1Lph6o7D6bU8WrcbG/kT7cVzi2UBi2xrrBfS/WUaD+ZcGd4MZ7+LbtFoGwbMVJH95d5aziBGyExYF4Urm2pjOQ==",
       "requires": {
-        "bindings": "^1.3.1",
-        "color": "^3.1.0",
+        "color": "^3.1.2",
         "detect-libc": "^1.0.3",
-        "fs-copy-file-sync": "^1.1.1",
-        "nan": "^2.12.1",
+        "nan": "^2.14.0",
         "npmlog": "^4.1.2",
-        "prebuild-install": "^5.2.2",
-        "semver": "^5.6.0",
-        "simple-get": "^3.0.3",
-        "tar": "^4.4.8",
+        "prebuild-install": "^5.3.3",
+        "semver": "^7.1.3",
+        "simple-get": "^3.1.0",
+        "tar": "^6.0.1",
         "tunnel-agent": "^0.6.0"
       }
     },
     "signal-exit": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
+      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA=="
     },
     "simple-concat": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.0.tgz",
-      "integrity": "sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY="
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q=="
     },
     "simple-get": {
       "version": "3.1.0",
@@ -3179,36 +3208,47 @@
       }
     },
     "tar": {
-      "version": "4.4.13",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
-      "integrity": "sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==",
-      "requires": {
-        "chownr": "^1.1.1",
-        "fs-minipass": "^1.2.5",
-        "minipass": "^2.8.6",
-        "minizlib": "^1.2.1",
-        "mkdirp": "^0.5.0",
-        "safe-buffer": "^5.1.2",
-        "yallist": "^3.0.3"
+      "version": "6.1.6",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.1.6.tgz",
+      "integrity": "sha512-oaWyu5dQbHaYcyZCTfyPpC+VmI62/OM2RTUYavTk1MDr1cwW5Boi3baeYQKiZbY2uSQJGr+iMOzb/JFxLrft+g==",
+      "requires": {
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "minipass": "^3.0.0",
+        "minizlib": "^2.1.1",
+        "mkdirp": "^1.0.3",
+        "yallist": "^4.0.0"
+      },
+      "dependencies": {
+        "chownr": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
+          "integrity": "sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ=="
+        },
+        "mkdirp": {
+          "version": "1.0.4",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+          "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw=="
+        }
       }
     },
     "tar-fs": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.0.0.tgz",
-      "integrity": "sha512-vaY0obB6Om/fso8a8vakQBzwholQ7v5+uy+tF3Ozvxv1KNezmVQAiWtcNmMHFSFPqL3dJA8ha6gdtFbfX9mcxA==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.1.tgz",
+      "integrity": "sha512-V0r2Y9scmbDRLCNex/+hYzvp/zyYjvFbHPNgVTKfQvVrb6guiE/fxP+XblDNR011utopbkex2nM4dHNV6GDsng==",
       "requires": {
         "chownr": "^1.1.1",
-        "mkdirp": "^0.5.1",
+        "mkdirp-classic": "^0.5.2",
         "pump": "^3.0.0",
-        "tar-stream": "^2.0.0"
+        "tar-stream": "^2.1.4"
       }
     },
     "tar-stream": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.1.0.tgz",
-      "integrity": "sha512-+DAn4Nb4+gz6WZigRzKEZl1QuJVOLtAwwF+WUxy1fJ6X63CaGaUAxJRD2KEn1OMfcbCjySTYpNC6WmfQoIEOdw==",
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
       "requires": {
-        "bl": "^3.0.0",
+        "bl": "^4.0.3",
         "end-of-stream": "^1.4.1",
         "fs-constants": "^1.0.0",
         "inherits": "^2.0.3",
@@ -3216,9 +3256,9 @@
       },
       "dependencies": {
         "readable-stream": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.5.0.tgz",
-          "integrity": "sha512-gSz026xs2LfxBPudDuI41V1lka8cxg64E66SGe78zJlsUofOg/yqwezdIcdfwik6B4h8LFmWPA9ef9X3FiNFLA==",
+          "version": "3.6.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
@@ -3226,9 +3266,9 @@
           }
         },
         "safe-buffer": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
-          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+          "version": "5.2.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
         },
         "string_decoder": {
           "version": "1.3.0",
@@ -3387,9 +3427,9 @@
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     },
     "yallist": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
-      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     }
   }
 }
diff --git a/package.json b/package.json
old mode 100755
new mode 100644
index b948f1f..1008698
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "multer": "^1.4.1",
     "request": "^2.88.0",
     "request-promise-native": "^1.0.5",
-    "sharp": "^0.21.0",
+    "sharp": "^0.24.1",
     "underscore": "^1.9.1",
     "uuid": "^3.3.2"
   },