docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -507,6 +507,7 @@ Thanks goes to these wonderful people
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       <td align="center" valign="top" width="14.28%"><a href="https://github.com/smk267"><img src="https://avatars.githubusercontent.com/u/88115182?v=4?s=100" width="100px;" alt="smk267"/><br /><sub><b>smk267</b></sub></a><br /><a href="#infra-smk267" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://www.dylangordon.co.nz/"><img src="https://avatars.githubusercontent.com/u/3656794?v=4?s=100" width="100px;" alt="Dylan Gordon"/><br /><sub><b>Dylan Gordon</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=agentdylan" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://michael.cousins.io"><img src="https://avatars.githubusercontent.com/u/2963448?v=4?s=100" width="100px;" alt="Michael Cousins"/><br /><sub><b>Michael Cousins</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=mcous" title="Documentation">📖</a> <a href="https://github.com/testing-library/testing-library-docs/pulls?q=is%3Apr+reviewed-by%3Amcous" title="Reviewed Pull Requests">👀</a></td>
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