docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -279,6 +279,7 @@ Add yourself to the contributors list [here](https://github.com/processing/proce
       <td align="center" valign="top" width="16.66%"><a href="https://github.com/rishabdev2997"><img src="https://avatars.githubusercontent.com/u/107137565?v=4?s=120" width="120px;" alt="Rishabdev Tudu"/><br /><sub><b>Rishabdev Tudu</b></sub></a><br /><a href="https://github.com/processing/processing4/commits?author=rishabdev2997" title="Documentation">📖</a> <a href="https://github.com/processing/processing4/commits?author=rishabdev2997" title="Code">💻</a></td>
       <td align="center" valign="top" width="16.66%"><a href="http://plopez.me"><img src="https://avatars.githubusercontent.com/u/37042253?v=4?s=120" width="120px;" alt="Pau"/><br /><sub><b>Pau</b></sub></a><br /><a href="https://github.com/processing/processing4/commits?author=plopez01" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="16.66%"><a href="http://d.hatena.ne.jp/junology/"><img src="https://avatars.githubusercontent.com/u/1933073?v=4?s=120" width="120px;" alt="Junology"/><br /><sub><b>Junology</b></sub></a><br /><a href="https://github.com/processing/processing4/commits?author=Junology" title="Code">💻</a></td>
+      <td align="center" valign="top" width="16.66%"><a href="https://github.com/twisst"><img src="https://avatars.githubusercontent.com/u/2244463?v=4?s=120" width="120px;" alt="Jaap Meijers"/><br /><sub><b>Jaap Meijers</b></sub></a><br /><a href="https://github.com/processing/processing4/commits?author=twisst" title="Documentation">📖</a></td>
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