chore: update karma to version ~2.0.0 (#57)

Author: renovate[bot]

package.json

@@ -48,7 +48,7 @@
     "jasmine-spec-reporter": "~4.2.0",
     "json-schema-faker": "^0.4.3",
     "json-server": "^0.12.0",
-    "karma": "~1.7.0",
+    "karma": "~2.0.0",
     "karma-chrome-launcher": "~2.2.0",
     "karma-cli": "~1.0.1",
     "karma-coverage-istanbul-reporter": "^1.2.1",