docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1112,6 +1112,7 @@ We recognize all types of contributions. This project follows the [all-contribut
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       <td align="center" valign="top" width="16.66%"><a href="https://github.com/webermayank"><img src="https://avatars.githubusercontent.com/u/111176033?v=4?s=120" width="120px;" alt="Mayank Verma"/><br /><sub><b>Mayank Verma</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=webermayank" title="Code">💻</a></td>
+      <td align="center" valign="top" width="16.66%"><a href="https://github.com/himanshuukholiya"><img src="https://avatars.githubusercontent.com/u/128818464?v=4?s=120" width="120px;" alt="Himanshu Kholiya"/><br /><sub><b>Himanshu Kholiya</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=himanshuukholiya" title="Code">💻</a></td>
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