Add/Update Badges on README

Author: “mptap”

README.md

@@ -1,4 +1,9 @@
+![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
 [![BuildStatus](https://travis-ci.org/sendgrid/smtpapi-java.svg?branch=master)](https://travis-ci.org/sendgrid/smtpapi-java)
+[![Email Notifications Badge](https://dx.sendgrid.com/badge/java)](https://dx.sendgrid.com/newsletter/java)
+[![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
+[![GitHub contributors](https://img.shields.io/github/contributors/sendgrid/smtpapi-java.svg)](https://github.com/sendgrid/smtpapi-java/graphs/contributors)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.txt)
 
 **This module allows you to build SendGrid's SMTP API headers with simplicity.**
 
@@ -89,4 +94,5 @@ smtpapi-java is guided and supported by the SendGrid [Developer Experience Team]
 
 smtpapi-java is maintained and funded by SendGrid, Inc. The names and logos for smtpapi-java are trademarks of SendGrid, Inc.
 
-![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
+# License
+[The MIT License (MIT)](LICENSE.txt)