chore(package): update karma to version 5.0.4

Closes #233

Author: greenkeeper[bot]

package.json

@@ -182,7 +182,7 @@
     "husky": "2.2.0",
     "jasmine-core": "3.4.0",
     "jasmine-spec-reporter": "4.2.1",
-    "karma": "4.1.0",
+    "karma": "5.0.4",
     "karma-chrome-launcher": "2.2.0",
     "karma-coverage-istanbul-reporter": "2.0.5",
     "karma-jasmine": "2.0.1",