docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -754,6 +754,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/TNThomas"><img src="https://avatars.githubusercontent.com/u/9881915?v=4?s=100" width="100px;" alt="TNThomas"/><br /><sub><b>TNThomas</b></sub></a><br /><a href="https://github.com/ashblue/fluid-behavior-tree/issues?q=author%3ATNThomas" title="Bug reports">🐛</a> <a href="https://github.com/ashblue/fluid-behavior-tree/commits?author=TNThomas" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Ownez"><img src="https://avatars.githubusercontent.com/u/10993641?v=4?s=100" width="100px;" alt="Ownez"/><br /><sub><b>Ownez</b></sub></a><br /><a href="https://github.com/ashblue/fluid-behavior-tree/commits?author=Ownez" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/angstr0m"><img src="https://avatars.githubusercontent.com/u/733176?v=4?s=100" width="100px;" alt="angstr0m"/><br /><sub><b>angstr0m</b></sub></a><br /><a href="https://github.com/ashblue/fluid-behavior-tree/issues?q=author%3Aangstr0m" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/darkgnostic"><img src="https://avatars.githubusercontent.com/u/4980221?v=4?s=100" width="100px;" alt="Izzy"/><br /><sub><b>Izzy</b></sub></a><br /><a href="https://github.com/ashblue/fluid-behavior-tree/issues?q=author%3Adarkgnostic" title="Bug reports">🐛</a></td>
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