docs: update readme.md [skip ci]

Author: allcontributors[bot]

readme.md

@@ -1962,6 +1962,7 @@ Thanks goes to these wonderful people who have contributed to this repository!
     <td align="center"><a href="https://juanmaruiz.surge.sh"><img src="https://avatars2.githubusercontent.com/u/1837650?v=4" width="100px;" alt=""/><br /><sub><b>JuanMa Ruiz</b></sub></a><br /><a href="#content-JuanMaRuiz" title="Content">🖋</a></td>
     <td align="center"><a href="https://luisangelorjr.com.br"><img src="https://avatars3.githubusercontent.com/u/22268900?v=4" width="100px;" alt=""/><br /><sub><b>Luís Ângelo Rodrigues Jr.</b></sub></a><br /><a href="#content-luisangelorjr" title="Content">🖋</a></td>
     <td align="center"><a href="https://jfernandezpe.wordpress.com/"><img src="https://avatars0.githubusercontent.com/u/12046620?v=4" width="100px;" alt=""/><br /><sub><b>José Fernández</b></sub></a><br /><a href="#content-jfernandezpe" title="Content">🖋</a></td>
+    <td align="center"><a href="http://www.linkedin.com/in/AlejandroGutierrezB"><img src="https://avatars3.githubusercontent.com/u/56408597?v=4" width="100px;" alt=""/><br /><sub><b>Alejandro Gutierrez Barcenilla</b></sub></a><br /><a href="#content-AlejandroGutierrezB" title="Content">🖋</a></td>
   </tr>
 </table>