docs: Add Discord badge

Author: nickserv

README.md

@@ -31,6 +31,7 @@ practices.</p>
 
 [![All Contributors](https://img.shields.io/badge/all_contributors-102-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]
+[![Discord][discord-badge]][discord]
 
 [![Watch on GitHub][github-watch-badge]][github-watch]
 [![Star on GitHub][github-star-badge]][github-star]
@@ -631,6 +632,7 @@ Contributions of any kind welcome!
 [bugs]: https://github.com/testing-library/react-testing-library/issues?q=is%3Aissue+is%3Aopen+label%3Abug+sort%3Acreated-desc
 [requests]: https://github.com/testing-library/react-testing-library/issues?q=is%3Aissue+sort%3Areactions-%2B1-desc+label%3Aenhancement+is%3Aopen
 [good-first-issue]: https://github.com/testing-library/react-testing-library/issues?utf8=✓&q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc+label%3A"good+first+issue"+
+[discord-badge]: https://img.shields.io/discord/723559267868737556.svg?color=7389D8&labelColor=6A7EC2&logo=discord&logoColor=ffffff&style=flat-square
 [discord]: https://discord.gg/c6JN9fM
 [stackoverflow]: https://stackoverflow.com/questions/tagged/react-testing-library
 [react-hooks-testing-library]: https://github.com/testing-library/react-hooks-testing-library