chore(package): update karma to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "imports-loader": "^0.8.0",
     "istanbul": "^0.4.5",
     "istanbul-instrumenter-loader": "^3.0.1",
-    "karma": "^2.0.5",
+    "karma": "^3.0.0",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage-istanbul-reporter": "^2.0.1",