Update contributors.json

[kapatych-be]

Please make sure to check the following tasks before opening and submitting a PR

• [x] I understand and have followed the contribution guide
• [x] I have tested my changes locally and they are working as intended

[Rexogamer]

To request maintainer status, please open an issue using the maintainer form.

[kapatych-be]

@Rexogamer Can this be done through this form?

https://github.com/revoltchat/frontend/issues/135

[Rexogamer]

You'll want the form here.

[kapatych-be]

Thank you.