chore(package): update nyc to version 14.1.0

Closes #444

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "mocha": "^5.1.1",
     "node-sass": "^4.8.3",
     "npm-run-all": "^4.1.2",
-    "nyc": "^11.7.1",
+    "nyc": "^14.1.0",
     "react": "^16.3.2",
     "react-dom": "^16.3.2",
     "react-router-dom": "^4.2.2",