chore(package): update karma to version 2.0.0

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "eslint": "^4.1.0",
     "jquery": "^3.2.1",
     "jsdom": "^11.0.0",
-    "karma": "^1.6.0",
+    "karma": "^2.0.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.3",