docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1936,6 +1936,9 @@ 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/CremaFR"><img src="https://avatars.githubusercontent.com/u/5360522?v=4?s=100" width="100px;" alt="Thomas Brillard"/><br /><sub><b>Thomas Brillard</b></sub></a><br /><a href="https://github.com/ethereum/ethereum-org-website/commits?author=CremaFR" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/YakshitAgarwal"><img src="https://avatars.githubusercontent.com/u/153830716?v=4?s=100" width="100px;" alt="Yakshit Agarwal"/><br /><sub><b>Yakshit Agarwal</b></sub></a><br /><a href="#content-YakshitAgarwal" title="Content">🖋</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://growthepie.xyz"><img src="https://avatars.githubusercontent.com/u/32496674?v=4?s=100" width="100px;" alt="Matthias Seidl"/><br /><sub><b>Matthias Seidl</b></sub></a><br /><a href="https://github.com/ethereum/ethereum-org-website/commits?author=mseidlx" title="Code">💻</a></td>
+    </tr>
   </tbody>
 </table>