chore(package): update nyc to version 14.1.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "codecov": "^3.0.4",
     "eslint": "^4.18.0",
     "mocha": "^5.2.0",
-    "nyc": "^12.0.2",
+    "nyc": "^14.1.0",
     "size-limit": "^1.0.1"
   },
   "repository": {