Update README.md

rwieruch · web-flow · commit dc158a823821 · 2018-06-25T10:11:52.000+08:00
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 # React Firebase Chat Example
 
+[![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/)
+
 * Found in [The Road to learn React](https://roadtoreact.com/)
 
 ## Features
