chore(package): update karma to version 5.0.1

Closes #70

Author: greenkeeper[bot]

Diff for: package.json

@@ -23,7 +23,7 @@
     "grunt-newer": "^1.2.0",
     "grunt-release-it": "^1.0.1",
     "jasmine-core": "^3.2.0",
-    "karma": "^4.0.1",
+    "karma": "^5.0.1",
     "karma-coverage": "^1.1.0",
     "karma-coveralls": "^2.0.0",
     "karma-jasmine": "^2.0.0",