chore(package): update karma to version 5.0.4

Closes #79

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "husky": "^1.3.1",
     "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",