Update dependency geckodriver to v1.16.1 (#441)

Author: renovate[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "eslint": "5.16.0",
     "eslint-config-airbnb": "17.1.0",
     "eslint-plugin-import": "2.16.0",
-    "geckodriver": "1.16.0",
+    "geckodriver": "1.16.1",
     "istanbul": "0.4.5",
     "mkdirp": "0.5.1",
     "mocha": "5.2.0",