chore(package): update karma-browserify to version 6.1.0

Closes #16

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "jasmine-core": "^2.8.0",
     "jquery": "^3.2.1",
     "karma": "^1.7.1",
-    "karma-browserify": "^5.1.1",
+    "karma-browserify": "^6.1.0",
     "karma-coverage": "^1.1.1",
     "karma-jasmine": "^1.1.0",
     "karma-jasmine-ajax": "^0.1.13",