chore(package): update nyc to version 14.0.0

Closes #13

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "core-js": "^2.5.6",
     "cross-env": "^5.1.5",
     "npm-run-all": "^4.1.3",
-    "nyc": "^12.0.1",
+    "nyc": "^14.0.0",
     "rxjs": "^5.5.10",
     "source-map-support": "^0.5.3",
     "tslint": "^5.10.0",