chore(package): update karma to version 4.0.1

Closes #17

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "grunt-usemin": "^3.0.0",
     "jasmine-core": "^2.3.4",
     "jshint-stylish": "^2.0.1",
-    "karma": "^2.0.0",
+    "karma": "^4.0.1",
     "karma-jasmine": "*",
     "karma-junit-reporter": "^1.2.0",
     "karma-phantomjs-launcher": "*",