chore(package): update karma-browserify to version 5.2.0

Closes #395

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "eslint-plugin-import": "2.5.0",
     "eslint-plugin-react": "7.1.0",
     "karma": "1.7.0",
-    "karma-browserify": "5.1.1",
+    "karma-browserify": "5.2.0",
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.3",
     "karma-phantomjs-launcher": "1.0.4",