chore(package): update karma to version 5.0.6

Closes #145

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "eslint": "^5.16.0",
     "jasmine-core": "~2.99.1",
     "jasmine-spec-reporter": "~4.2.1",
-    "karma": "~4.0.0",
+    "karma": "~5.0.6",
     "karma-chrome-launcher": "~2.2.0",
     "karma-coverage-istanbul-reporter": "~2.0.1",
     "karma-firefox-launcher": "~1.1.0",