Update README.md

Author: rwieruch

README.md

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 # visual-regression-testing-react-storybook
 
+[![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/)
+
 A React application which implements visual regression tests by using Jest and React Storybook. Read more about it: [Visual Regression Testing and React Storybook](https://www.robinwieruch.de/visual-regression-testing-react-storybook/)
 
 ## Features