fix(package): update nodemailer to version 4.4.1

Closes #21

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "morgan": "^1.6.1",
     "node-foursquare": "^0.3.0",
     "node-linkedin": "^0.5.0",
-    "nodemailer": "^3.0.2",
+    "nodemailer": "^4.4.1",
     "passport": "^0.3.2",
     "passport-facebook": "^2.0.0",
     "passport-github": "^1.0.0",