ATLauncher Flatpak request

Project information: ATLauncher is a Launcher for Minecraft which integrates multiple different ModPacks to allow you to download and install ModPacks easily and quickly.

Name: ATLauncher
Homepage: atlauncher.com
License: https://github.com/ATLauncher/ATLauncher/blob/master/LICENSE
Upstream has been contacted: https://github.com/ATLauncher/ATLauncher/issues/401