Merge pull request cnodejs#690 from cnodejs/greenkeeper-nodemailer-2.0.0

Update nodemailer to version 2.0.0 🚀

Author: alsotang

package.json

@@ -39,7 +39,7 @@
     "mongoose": "4.3.5",
     "multiline": "1.0.2",
     "node-uuid": "1.4.7",
-    "nodemailer": "1.11.0",
+    "nodemailer": "2.0.0",
     "nodemailer-smtp-transport": "1.1.0",
     "oneapm": "1.2.18",
     "passport": "0.3.2",