chore(package): update karma-mocha to version 2.0.1

Closes #1974

Author: greenkeeper[bot]

package.json

@@ -90,7 +90,7 @@
     "karma": "^4.2.0",
     "karma-chai": "^0.1.0",
     "karma-firefox-launcher": "^1.2.0",
-    "karma-mocha": "^1.3.0",
+    "karma-mocha": "^2.0.1",
     "karma-sinon": "^1.0.5",
     "karma-webpack": "^4.0.2",
     "mocha": "^3.5.3",