chore(deps): update dependency karma to v3.1.1

Author: renovate-bot

package.json

@@ -30,7 +30,7 @@
     "fetch-mock": "6.5.2",
     "http-server": "0.11.1",
     "istanbul-instrumenter-loader": "3.0.1",
-    "karma": "3.1.0",
+    "karma": "3.1.1",
     "karma-chrome-launcher": "2.2.0",
     "karma-cli": "1.0.1",
     "karma-coverage": "1.1.2",