docs: update README.md

Author: allcontributors[bot]

README.md

@@ -592,6 +592,9 @@ Thanks goes to these people ([emoji key][emojis]):
     <td align="center"><a href="https://twitter.com/matanbobi"><img src="https://avatars2.githubusercontent.com/u/12711091?v=4" width="100px;" alt=""/><br /><sub><b>Matan Borenkraout</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=MatanBobi" title="Code">💻</a></td>
     <td align="center"><a href="http://ryanbigg.com"><img src="https://avatars3.githubusercontent.com/u/2687?v=4" width="100px;" alt=""/><br /><sub><b>Ryan Bigg</b></sub></a><br /><a href="#maintenance-radar" title="Maintenance">🚧</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="https://antonhalim.com"><img src="https://avatars1.githubusercontent.com/u/10498035?v=4" width="100px;" alt=""/><br /><sub><b>Anton Halim</b></sub></a><br /><a href="https://github.com/testing-library/react-testing-library/commits?author=antonhalim" title="Documentation">📖</a></td>
+  </tr>
 </table>
 
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