chore(package): update karma to version 5.0.3

Closes #104

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
     "express": "^4.16.4",
     "istanbul": "^0.4.5",
     "jasmine-core": "^3.4.0",
-    "karma": "^4.1.0",
+    "karma": "^5.0.3",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage": "^1.1.2",
     "karma-firefox-launcher": "^1.1.0",