v0.3.1

A minor update fixing some issues with custom modelines in DRM.

This update is ABI-compatible with 0.3.0.

Fixes

• drm: fix custom mode check
• drm: fixup modeline calculation

MRs

• Unbreak build on FreeBSD due to missing header by @jbeich in #42

Full Changelog: v0.3.0...v0.3.1