Merge pull request #116 from sensu/gitter-to-slack

Change community chat badge to point to slack

README.md

@@ -1,6 +1,6 @@
 # Sensu [![Ansible Galaxy](https://img.shields.io/badge/galaxy-cmacrae.sensu-660198.svg?style=flat)](https://galaxy.ansible.com/cmacrae/sensu/)
 
-[![Join the chat at https://gitter.im/cmacrae/ansible-sensu](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/cmacrae/ansible-sensu?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Join the chat at https://slack.sensu.io/](https://slack.sensu.io/badge.svg)](https://slack.sensu.io/)
 
 This role deploys a full [Sensu](https://sensuapp.org) stack, a modern, open source monitoring framework.