chore(package): update karma to version 5.0.1

Closes #34

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "chai-string": "^1.4.0",
     "eslint": "^5.0.0",
     "hoek": "^5.0.3",
-    "karma": "^2.0.5",
+    "karma": "^5.0.1",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",