Beta D 2.068.0-b2 + vibe.d 0.7.24-rc.1

[Sönke Ludwig via Digitalmars-d-announce]

The first RC of vibe.d 0.7.24 has also just been released. It works with 
DMD 2.068.0-b2. The final release will happen in lock-step with the DMD 
release.

Changelog:
https://github.com/rejectedsoftware/vibe.d/blob/master/CHANGELOG.md