chore(package): update karma to version 2.0.3

Closes #378

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "eslint": "4.1.0",
     "eslint-plugin-import": "2.5.0",
     "eslint-plugin-react": "7.1.0",
-    "karma": "1.7.0",
+    "karma": "2.0.3",
     "karma-browserify": "5.1.1",
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.3",