chore(package): update mocha to version 7.1.2

Closes #37

Author: greenkeeper[bot]

packages/core/package.json

@@ -59,7 +59,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^3.0.5",
     "markdown-toc": "^1.2.0",
-    "mocha": "^6.0.2",
+    "mocha": "^7.1.2",
     "nyc": "^13.3.0",
     "phantomjs-prebuilt": "^2.1.16",
     "rollup": "^1.4.0",