docs: update README.md

Author: allcontributors[bot]

README.md

@@ -304,6 +304,7 @@ Thanks goes to these people ([emoji key][emojis]):
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     <td align="center"><a href="https://github.com/nathanforce"><img src="https://avatars2.githubusercontent.com/u/6694194?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nathan Force</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=nathanforce" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/ph-fritsche"><img src="https://avatars.githubusercontent.com/u/39068198?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Philipp Fritsche</b></sub></a><br /><a href="https://github.com/testing-library/dom-testing-library/commits?author=ph-fritsche" title="Code">💻</a></td>
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