Update README.md

Author: rwieruch

README.md

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 # React Snake (Functional Style)
 
+[![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/)
+
 * Found in [Taming the State in React](https://roadtoreact.com/course-details?courseId=TAMING_THE_STATE)
 * [Live](https://evening-everglades-29185.herokuapp.com/)
 
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 * [Part 02](https://github.com/rwieruch/react-snake/tree/2.0.0)
 * [Part 03](https://github.com/rwieruch/react-snake/tree/3.0.0)
 * [Part 04](https://github.com/rwieruch/react-snake/tree/4.0.0)
-* [Part 05](https://github.com/rwieruch/react-snake/tree/5.0.0)
+* [Part 05](https://github.com/rwieruch/react-snake/tree/5.0.0)