chore(package): update chromedriver to version 2.23.1

https://greenkeeper.io/

package.json

@@ -47,7 +47,7 @@
   },
   "dependencies": {
     "body-parser": "^1.15.2",
-    "chromedriver": "^2.23.0",
+    "chromedriver": "^2.23.1",
     "co": "^4.6.0",
     "eventemitter2": "^2.1.0",
     "express": "^4.13.4",