chore(package): update nyc to version 14.1.1

Closes #80

Author: greenkeeper[bot]

package.json

@@ -62,7 +62,7 @@
     "istanbul": "^0.4.5",
     "mocha": "^5.2.0",
     "nodemon": "^1.17.5",
-    "nyc": "^13.1.0",
+    "nyc": "^14.1.1",
     "request": "^2.87.0",
     "request-promise": "^4.2.2"
   }