docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -185,6 +185,7 @@ Thanks goes to these wonderful people ([emoji key](https://github.com/all-contri
     <td align="center"><a href="https://github.com/alQlagin"><img src="https://avatars.githubusercontent.com/u/3256488?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alex Kulagin</b></sub></a><br /><a href="https://github.com/webcat12345/ngx-intl-tel-input/commits?author=alQlagin" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/subodhyadav712"><img src="https://avatars.githubusercontent.com/u/36027830?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Subodh Kumar Yadav</b></sub></a><br /><a href="https://github.com/webcat12345/ngx-intl-tel-input/commits?author=subodhyadav712" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/harshalganbote"><img src="https://avatars.githubusercontent.com/u/60728890?v=4?s=100" width="100px;" alt=""/><br /><sub><b>harshalganbote</b></sub></a><br /><a href="https://github.com/webcat12345/ngx-intl-tel-input/commits?author=harshalganbote" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/christianopaets"><img src="https://avatars.githubusercontent.com/u/43338174?v=4?s=100" width="100px;" alt=""/><br /><sub><b>christianopaets</b></sub></a><br /><a href="https://github.com/webcat12345/ngx-intl-tel-input/commits?author=christianopaets" title="Code">💻</a></td>
   </tr>
 </table>