Support for Jetbrains Space

While still in early access (see https://www.jetbrains.com/space/), I really like what they do and wouldn’t mind to move there with some of my project asap - of course taking Drone with me.

Looks like Space support needs to be added to both github.com/drone/go-login and github.com/drone/go-scm, while the latter seems to be quite serious endeavor?