chore(package): update karma to version 5.0.5

Closes #4

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "istanbul-instrumenter-loader": "^3.0.1",
     "jasmine": "^3.1.0",
     "jasmine-spec-reporter": "^4.2.1",
-    "karma": "^2.0.2",
+    "karma": "^5.0.5",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage-istanbul-reporter": "^2.0.1",
     "karma-jasmine": "^1.1.2",