Merge pull request #38 from mptap/update-readme

Add/Update Badges on README

Author: Matt Bernier

README.md

@@ -1,4 +1,9 @@
+![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
 [![Travis Badge](https://travis-ci.org/sendgrid/smtpapi-csharp.svg?branch=master)](https://travis-ci.org/sendgrid/smtpapi-csharp)
+[![Email Notifications Badge](https://dx.sendgrid.com/badge/csharp)](https://dx.sendgrid.com/newsletter/csharp)
+[![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-csharp.svg)](https://github.com/sendgrid/smtpapi-csharp/graphs/contributors)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.txt)
 
 **This module helps build SendGrid's SMTP API headers.**
 
@@ -114,4 +119,5 @@ smtpapi-csharp is guided and supported by the SendGrid [Developer Experience Tea
 
 smtpapi-csharp is maintained and funded by SendGrid, Inc. The names and logos for smtpapi-csharp 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)