Add Twitter follow badge URL
[![Apache Licensed](https://img.shields.io/github/license/StackStorm/st2)](LICENSE)
[![Join our community Slack](https://img.shields.io/badge/slack-stackstorm-success.svg?logo=slack)](https://stackstorm.com/community-signup)
[![Forum](https://img.shields.io/discourse/https/forum.stackstorm.com/posts.svg)](https://forum.stackstorm.com/)
-![Twitter Follow](https://img.shields.io/twitter/follow/StackStorm?style=social)
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+[![Twitter Follow](https://img.shields.io/twitter/follow/StackStorm?style=social)](https://twitter.com/StackStorm/)
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## TL;DR
