chore(package): update karma to version 1.7.1

Closes #83

Author: greenkeeper[bot]

package.json

@@ -102,7 +102,7 @@
     "ghooks": "2.0.0",
     "imports-loader": "0.7.0",
     "json-loader": "0.5.4",
-    "karma": "1.4.1",
+    "karma": "1.7.1",
     "karma-coverage": "1.1.1",
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.2",