Add twitter badge

README.md

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 <img src="https://raw.githubusercontent.com/stampit-org/stampit-logo/master/stampit-logo.png" alt="stampit" width="160" />
 
-# Stampit [![Travis-CI](https://travis-ci.org/stampit-org/stampit.svg)](https://travis-ci.org/stampit-org/stampit)[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stampit-org/stampit?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+# Stampit [![Travis-CI](https://travis-ci.org/stampit-org/stampit.svg)](https://travis-ci.org/stampit-org/stampit)[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/stampit-org/stampit?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)[![Twitter Follow](https://img.shields.io/twitter/follow/stampit.svg?style=social&label=Follow&maxAge=2592000)](https://twitter.com/stampit_org)
 
 **Create objects from reusable, composable behaviors**