v0.5.1

A minor update with some stability improvements.

This update maintains ABI and API stability with 0.5.0.

Fixes

• buffer: remove useless forward def

MRs

• drm: Validate conn before dereference in CDRMAtomicRequest::commit() by @ziyao233 in #108
• clearer flow when rescanning connectors by @ikalco in #113
• allow multigpu blit from explicit to implicit by @ikalco in #114

Full Changelog: v0.5.0...v0.5.1