docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -113,6 +113,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
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     <td align="center"><a href="https://github.com/BenJam"><img src="https://avatars2.githubusercontent.com/u/158833?v=4" width="64px;" alt=""/><br /><sub><b>Benjamin Nickolls</b></sub></a><br /><a href="https://github.com/github/docs/commits?author=BenJam" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://mcaffer.com"><img src="https://avatars2.githubusercontent.com/u/10070956?v=4" width="64px;" alt=""/><br /><sub><b>Jeff McAffer</b></sub></a><br /><a href="https://github.com/github/docs/commits?author=jeffmcaffer" title="Documentation">📖</a></td>
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