Update README.md

README.md

@@ -1,9 +1,14 @@
 ![Crowi](http://res.cloudinary.com/hrscywv4p/image/upload/c_limit,f_auto,h_900,q_80,w_1200/v1/199673/https_www_filepicker_io_api_file_VpYEP32ZQyCZ85u6XCXo_zskpra.png)
 
-crowi-plus [![Join the chat at https://gitter.im/weseek/crowi-plus](https://badges.gitter.im/weseek/crowi-plus.svg)](https://gitter.im/weseek/crowi-plus?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+<p align="center">
+  <a href="https://heroku.com/deploy?template=https://github.com/weseek/crowi-plus/tree/v1.0.0-RC11"><img src="https://www.herokucdn.com/deploy/button.png">)</a>
+</p>
+
+
+crowi-plus
 ===========
 
-[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/weseek/crowi-plus/tree/v1.0.0-RC11)
+[Chat on Slack](https://crowi-plus.slack.com/)
 
 [![wercker status](https://app.wercker.com/status/39cdc49d067d65c39cb35d52ceae6dc1/s/master "wercker status")](https://app.wercker.com/project/byKey/39cdc49d067d65c39cb35d52ceae6dc1)
 [![dependencies status](https://david-dm.org/weseek/crowi-plus.svg)](https://david-dm.org/weseek/crowi-plus)