chore(package): update nyc to version 14.1.1

Closes #20

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "eslint-config-google": "^0.8.0",
     "jsdoc-to-markdown": "^3.0.0",
     "mocha": "*",
-    "nyc": "^11.0.2",
+    "nyc": "^14.1.1",
     "proxyquire": "^1.7.10"
   },
   "scripts": {