vibe.d 0.7.31-rc.3 release candidate

[Sönke Ludwig via Digitalmars-d-announce]

The third release candidate of 0.7.31 has been tagged (the two previous 
ones still had issues, so I skipped the announcement). Contrary to the 
initial plan, 0.7.31 will be released prior to 0.8.0, which still can 
use a little more time to mature.

If you plan to stay on the 0.7.x branch, please take the opportunity to 
test this (e.g. keep dependency to `~>0.7.30` and then do `dub upgrade 
--prerelease`). The final release is scheduled for next Monday (April 10th).

Change log:
https://github.com/rejectedsoftware/vibe.d/blob/0.7.x/CHANGELOG.md

DUB: https://code.dlang.org/packages/vibe-d/0.7.31-rc.3