chore(package): update mocha to version 7.1.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "eslint": "^5.0.0",
     "istanbul": "^0.4.5",
     "jsdoc": "^3.4.3",
-    "mocha": "^5.0.0",
+    "mocha": "^7.1.0",
     "sinon": "^6.0.0",
     "webpack": "^4.0.0",
     "webpack-cli": "^3.1.0"