chore(package): update mocha to version 6.1.4

Closes #244

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "eslint-plugin-prettier": "^2.1.1",
     "eslint-plugin-react": "^7.0.1",
     "faker": "^4.1.0",
-    "mocha": "^3.2.0",
+    "mocha": "^6.1.4",
     "nw-builder": "^3.1.2",
     "prettier": "^1.3.1",
     "supertest": "^3.0.0",