chore(package): update karma to version 4.1.0

Closes #51

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "documentation": "4.0.0-beta16",
     "eslint": "3.12.2",
     "imports-loader": "0.7.0",
-    "karma": "1.3.0",
+    "karma": "4.1.0",
     "karma-coverage": "1.1.1",
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.1",