chore(package): update karma-browserify to version 6.0.0

Closes #140

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "jasmine-core": "2.6.1",
     "jquery": "3.2.1",
     "karma": "1.7.0",
-    "karma-browserify": "5.1.1",
+    "karma-browserify": "6.0.0",
     "karma-chrome-launcher": "2.1.1",
     "karma-cli": "1.0.1",
     "karma-firefox-launcher": "1.0.1",