chore(package): update mocha to version 7.1.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
     "babel-loader": "^8.0.5",
     "chai": "^4.2.0",
     "coveralls": "^3.0.3",
-    "mocha": "^6.1.4",
+    "mocha": "^7.1.0",
     "nyc": "^14.1.1",
     "webpack": "^4.31.0",
     "webpack-cli": "^3.3.2"