Update dependency karma-firefox-launcher to v2

Author: renovate[bot]

cucumber-selenium-grid/angularjs/package.json

@@ -18,7 +18,7 @@
     "jasmine-core": "^2.2.0",
     "karma": "^0.13.0",
     "karma-chrome-launcher": "^0.2.2",
-    "karma-firefox-launcher": "^0.1.7",
+    "karma-firefox-launcher": "^2.0.0",
     "karma-jasmine": "^0.3.5",
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",