chore(package): update karma to version 5.0.8

Closes #117

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "http-server": "^0.12.1",
     "istanbul-instrumenter-loader": "^3.0.1",
     "jasmine-core": "^3.5.0",
-    "karma": "^4.4.1",
+    "karma": "^5.0.8",
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage": "^2.0.1",
     "karma-jasmine": "^3.1.0",