chore(package): update karma to version 5.0.4

Closes #110

Author: greenkeeper[bot]

package.json

@@ -95,7 +95,7 @@
     "husky": "^1.3.1",
     "jasmine-core": "~3.3.0",
     "jasmine-spec-reporter": "^4.1.0",
-    "karma": "^4.2.0",
+    "karma": "^5.0.4",
     "karma-chrome-launcher": "^2.2.0",
     "karma-cli": "~2.0.0",
     "karma-coverage-istanbul-reporter": "^2.0.5",