docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1107,6 +1107,7 @@ We recognize all types of contributions. This project follows the [all-contribut
       <td align="center" valign="top" width="16.66%"><img src="https://hello-assets.p5js.org/placeholder_avatar.png?s=120" width="120px;" alt="Aaron Welles"/><br /><sub><b>Aaron Welles</b></sub><br /><a href="#example" title="Examples">💡</a></td>
       <td align="center" valign="top" width="16.66%"><a href="https://github.com/seyko1"><img src="https://avatars.githubusercontent.com/u/26870879?v=4?s=120" width="120px;" alt="Seyko"/><br /><sub><b>Seyko</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=seyko1" title="Code">💻</a></td>
       <td align="center" valign="top" width="16.66%"><a href="http://kinardist.media"><img src="https://avatars.githubusercontent.com/u/21345916?v=4?s=120" width="120px;" alt="Xevi H. Aqeel"/><br /><sub><b>Xevi H. Aqeel</b></sub></a><br /><a href="#example-thekinardist" title="Examples">💡</a> <a href="#design-thekinardist" title="Design">🎨</a></td>
+      <td align="center" valign="top" width="16.66%"><a href="https://www.youtube.com/c/HigherMathNotes"><img src="https://avatars.githubusercontent.com/u/51820777?v=4?s=120" width="120px;" alt="Greg Stanton"/><br /><sub><b>Greg Stanton</b></sub></a><br /><a href="https://github.com/processing/p5.js/issues?q=author%3AGregStanton" title="Bug reports">🐛</a> <a href="https://github.com/processing/p5.js/commits?author=GregStanton" title="Code">💻</a> <a href="https://github.com/processing/p5.js/commits?author=GregStanton" title="Documentation">📖</a> <a href="#example-GregStanton" title="Examples">💡</a> <a href="#ideas-GregStanton" title="Ideas, Planning, & Feedback">🤔</a> <a href="#plugin-GregStanton" title="Plugin/utility libraries">🔌</a> <a href="#projectManagement-GregStanton" title="Project Management">📆</a> <a href="#promotion-GregStanton" title="Promotion">📣</a> <a href="#question-GregStanton" title="Answering Questions">💬</a> <a href="#research-GregStanton" title="Research">🔬</a></td>
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