chore(package): update karma to version 1.6.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
     "fetch-mock": "5.9.4",
     "http-server": "0.9.0",
     "istanbul-instrumenter-loader": "2.0.0",
-    "karma": "1.5.0",
+    "karma": "1.6.0",
     "karma-chrome-launcher": "2.0.0",
     "karma-cli": "1.0.1",
     "karma-coverage": "1.1.1",