update README.pt-BR.md [skip ci]

README.pt-BR.md

@@ -330,6 +330,9 @@ Obrigado vai para essas pessoas maravilhosas ([emoji key](https://allcontributor
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/wljince007"><img src="https://avatars.githubusercontent.com/u/88243938?v=4?s=100" width="100px;" alt="wljince007"/><br /><sub><b>wljince007</b></sub></a><br /><a href="https://github.com/Eugeny/tabby/commits?author=wljince007" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/FeroTheFox"><img src="https://avatars.githubusercontent.com/u/52982404?v=4?s=100" width="100px;" alt="fero"/><br /><sub><b>fero</b></sub></a><br /><a href="https://github.com/Eugeny/tabby/commits?author=FeroTheFox" title="Code">💻</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://siebsie23.nl/"><img src="https://avatars.githubusercontent.com/u/25083973?v=4?s=100" width="100px;" alt="Sibren"/><br /><sub><b>Sibren</b></sub></a><br /><a href="https://github.com/Eugeny/tabby/commits?author=siebsie23" title="Code">💻</a></td>
+    </tr>
   </tbody>
 </table>