chore(package): update yargs to version 13.2.4

Closes #66

Author: greenkeeper[bot]

package.json

@@ -85,6 +85,6 @@
     "request-promise": "^4.2.2",
     "webpack": "^4.2.0",
     "webpack-cli": "^3.0.8",
-    "yargs": "^12.0.1"
+    "yargs": "^13.2.4"
   }
 }