chore(package): update nyc to version 14.1.0

Closes #190

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "json-loader": "^0.5.7",
     "manifest-scope-loader": "^1.0.1",
     "mutationobserver-shim": "^0.3.2",
-    "nyc": "^11.5.0",
+    "nyc": "^14.1.0",
     "offline-plugin": "^4.9.0",
     "properties-loader": "0.0.1",
     "style-loader": "^0.20.1",