chore(package): update karma to version 3.1.3

tested
greenkeeper-issue: #471

package.json

@@ -75,7 +75,7 @@
     "html-webpack-plugin": "^3.2.0",
     "http-server": "^0.11.0",
     "jquery": "^3.2.1",
-    "karma": "^3.0.0",
+    "karma": "^3.1.3",
     "karma-base64-to-js-preprocessor": "^0.0.1",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",