Update dependency geckodriver to v1.11.0 (#342)

Author: renovate[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "eslint": "4.12.1",
     "eslint-config-airbnb": "16.1.0",
     "eslint-plugin-import": "2.8.0",
-    "geckodriver": "1.10.0",
+    "geckodriver": "1.11.0",
     "istanbul": "0.4.5",
     "mkdirp": "0.5.1",
     "mocha": "5.0.0",