docs: update README.md [skip ci]

README.md

@@ -1067,6 +1067,7 @@ We recognize all types of contributions. This project follows the [all-contribut
       <td align="center" valign="top" width="16.66%"><a href="http://computationalmama.xyz"><img src="https://avatars.githubusercontent.com/u/10388784?v=4?s=120" width="120px;" alt="computational mama"/><br /><sub><b>computational mama</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=computationalmama" title="Code">💻</a></td>
       <td align="center" valign="top" width="16.66%"><a href="https://fabianmoronzirfas.me"><img src="https://avatars.githubusercontent.com/u/315106?v=4?s=120" width="120px;" alt="Fabian Morón Zirfas"/><br /><sub><b>Fabian Morón Zirfas</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=ff6347" title="Documentation">📖</a> <a href="https://github.com/processing/p5.js/commits?author=ff6347" title="Code">💻</a></td>
       <td align="center" valign="top" width="16.66%"><a href="http://www.lukeplowden.com"><img src="https://avatars.githubusercontent.com/u/62835749?v=4?s=120" width="120px;" alt="Luke Plowden"/><br /><sub><b>Luke Plowden</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=lukeplowden" title="Code">💻</a></td>
+      <td align="center" valign="top" width="16.66%"><a href="https://github.com/martinleopold"><img src="https://avatars.githubusercontent.com/u/1692826?v=4?s=120" width="120px;" alt="Martin Leopold"/><br /><sub><b>Martin Leopold</b></sub></a><br /><a href="https://github.com/processing/p5.js/issues?q=author%3Amartinleopold" title="Bug reports">🐛</a> <a href="https://github.com/processing/p5.js/commits?author=martinleopold" title="Code">💻</a></td>
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