Add release heads-up

 - Add before repo description
 - Bump down breaking change announcement
 - Add in "Announcements"

Author: gabrielkrell

README.md

@@ -1,10 +1,12 @@
 [![Travis Badge](https://travis-ci.org/sendgrid/sendgrid-python.svg?branch=master)](https://travis-ci.org/sendgrid/sendgrid-python)
 [![Email Notifications Badge](https://dx.sendgrid.com/badge/python)](https://dx.sendgrid.com/newsletter/python)
 
-Please see our announcement regarding [breaking changes](https://github.com/sendgrid/sendgrid-python/issues/217). Your support is appreciated!
+New: subscribe to email [release notifications](https://dx.sendgrid.com/newsletter/python) for releases and breaking changes.
 
 **This library allows you to quickly and easily use the SendGrid Web API v3 via Python.**
 
+Please see our announcement regarding [breaking changes](https://github.com/sendgrid/sendgrid-python/issues/217). Your support is appreciated!
+
 Version 3.X.X+ of this library provides full support for all SendGrid [Web API v3](https://sendgrid.com/docs/API_Reference/Web_API_v3/index.html) endpoints, including the new [v3 /mail/send](https://sendgrid.com/blog/introducing-v3mailsend-sendgrids-new-mail-endpoint).
 
 This library represents the beginning of a new path for SendGrid. We want this library to be community driven and SendGrid led. We need your help to realize this goal. To help make sure we are building the right things in the right order, we ask that you create [issues](https://github.com/sendgrid/sendgrid-python/issues) and [pull requests](https://github.com/sendgrid/sendgrid-python/blob/master/CONTRIBUTING.md) or simply upvote or comment on existing issues or pull requests.
@@ -169,7 +171,7 @@ Please see [our helper](https://github.com/sendgrid/sendgrid-python/tree/master/
 
 Please see our announcement regarding [breaking changes](https://github.com/sendgrid/sendgrid-python/issues/217). Your support is appreciated!
 
-All updates to this library is documented in our [CHANGELOG](https://github.com/sendgrid/sendgrid-python/blob/master/CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-python/releases).
+All updates to this library are documented in our [CHANGELOG](https://github.com/sendgrid/sendgrid-python/blob/master/CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-python/releases).  You may also subscribe to email [release notifications](https://dx.sendgrid.com/newsletter/python) for releases and breaking changes.
 
 <a name="roadmap"></a>
 # Roadmap