chore(package): update karma to version 5.0.4

Closes #79

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "jasmine-core": "^3.4.0",
     "jquery": "^3.4.1",
     "json-loader": "0.5.7",
-    "karma": "^4.1.0",
+    "karma": "^5.0.4",
     "karma-chrome-launcher": "^2.2.0",
     "karma-jasmine": "^2.0.1",
     "karma-webpack": "^3.0.5",