Merge pull request cnodejs#680 from cnodejs/greenkeeper-validator-4.5.0

Update validator to version 4.5.0 🚀

Author: alsotang

package.json

@@ -51,7 +51,7 @@
     "response-time": "2.3.1",
     "superagent": "1.6.1",
     "utility": "1.6.0",
-    "validator": "4.4.0",
+    "validator": "4.5.0",
     "xmlbuilder": "4.2.0",
     "xss": "0.2.10"
   },