docs: update README.md

Author: allcontributors[bot]

README.md

@@ -614,6 +614,7 @@ Thanks goes to these people ([emoji key][emojis]):
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     <td align="center"><a href="https://github.com/ImADrafter"><img src="https://avatars.githubusercontent.com/u/44379989?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Marcos Gómez</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=ImADrafter" title="Documentation">📖</a></td>
     <td align="center"><a href="https://www.akashshyam.online/"><img src="https://avatars.githubusercontent.com/u/56759828?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Akash Shyam</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/issues?q=author%3Aakashshyamdev" title="Bug reports">🐛</a></td>
+    <td align="center"><a href="https://hen.ne.ke"><img src="https://avatars.githubusercontent.com/u/4312191?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Fabian Meumertzheim</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=fmeum" title="Code">💻</a> <a href="https://github.com/testing-library/react-testing-library/issues?q=author%3Afmeum" title="Bug reports">🐛</a></td>
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