Can't build drone 0.5.0 due to github.com/drone/mq non existing

I’ve tried to build drone from v0.5.0 tag but it fails due to not finding github.com/drone/mq, which is referenced by many places (import and Makefile) and I can confirm is a 404 right now.

What happened to that dependency ? Is there any way to build 0.5 branch at this moment ?