chore(deps): update dependency prettier to v1.15.1

Author: renovate-bot

package.json

@@ -29,7 +29,7 @@
     "graphql": "0.13.2",
     "graphql-middleware": "1.7.8",
     "graphql-tools": "4.0.3",
-    "prettier": "1.14.3",
+    "prettier": "1.15.1",
     "prettier-check": "2.0.0",
     "semantic-release": "15.8.1",
     "ts-node": "7.0.1",

yarn.lock

@@ -3260,9 +3260,9 @@ [email protected]:
   dependencies:
     execa "^0.6.0"
 
-prettier@1.14.3:
-  version "1.14.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.14.3.tgz#90238dd4c0684b7edce5f83b0fb7328e48bd0895"
+prettier@1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.15.1.tgz#06c67106afb1b40e74b002353b2079cc7e0e67bf"
 
 pretty-ms@^0.2.1:
   version "0.2.2"