chore(package): update karma to version 4.0.0

Closes #6

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "grunt-usemin": "^3.1.1",
     "grunt-wiredep": "^3.0.1",
     "jshint-stylish": "^2.2.1",
-    "karma": "^1.3.0",
+    "karma": "^4.0.0",
     "karma-jasmine": "^1.1.0",
     "karma-phantomjs-launcher": "^1.0.2",
     "load-grunt-tasks": "^3.5.2",