add dotty-cps-async to community build

[rssh]

No description provided.

[dottybot]

Hello, and thank you for opening this PR! 🎉

All contributors have signed the CLA, thank you! ❤️

Have an awesome day! ☀️

[anatoliykmetyuk]

Hi @rssh, thanks for contributing this project to the build! All of the Dotty community build projects reside as forks in dotty-staging organization. I've created such a fork for your project: https://github.com/dotty-staging/dotty-cps-async

Could you update this PR to use this repo?

[rssh]

thanks, done.

[anatoliykmetyuk]

LGTM, thanks!