chore(package): update nyc to version 14.1.1

Closes #26

Author: greenkeeper[bot]

packages/core/package.json

@@ -60,7 +60,7 @@
     "karma-webpack": "^3.0.5",
     "markdown-toc": "^1.2.0",
     "mocha": "^6.0.2",
-    "nyc": "^13.3.0",
+    "nyc": "^14.1.1",
     "phantomjs-prebuilt": "^2.1.16",
     "rollup": "^1.4.0",
     "rollup-plugin-babel": "^4.3.2",