docs: update README.md [skip ci]

README.md

@@ -131,6 +131,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/raymondelooff"><img src="https://avatars0.githubusercontent.com/u/9716806?v=4" width="100px;" alt=""/><br /><sub><b>Raymon de Looff</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=raymondelooff" title="Code">💻</a></td>
     <td align="center"><a href="http://codemonkeylabs.com"><img src="https://avatars2.githubusercontent.com/u/704034?v=4" width="100px;" alt=""/><br /><sub><b>John Clayton</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=jsclayton" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/Germs2004"><img src="https://avatars2.githubusercontent.com/u/5519340?v=4" width="100px;" alt=""/><br /><sub><b>Germs2004</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=Germs2004" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/lukwil"><img src="https://avatars1.githubusercontent.com/u/30203234?v=4" width="100px;" alt=""/><br /><sub><b>Lukas Willburger</b></sub></a><br /><a href="https://github.com/containrrr/watchtower/commits?author=lukwil" title="Code">💻</a></td>
   </tr>
 </table>