fix(package): update selenium-webdriver to version 3.1.0 (#256)

https://greenkeeper.io/

package.json

@@ -113,7 +113,7 @@
     "moment": "2.17.0",
     "ps-tree": "^1.1.0",
     "retry-promise": "1.0.0",
-    "selenium-webdriver": "3.0.0",
+    "selenium-webdriver": "3.1.0",
     "socket.io": "1.5.0",
     "ws": "2.0.3"
   },