This is the first beta release for kirby-seo 1.0 - the next major version.
There has been a massive overhaul & refactoring of the Meta class, and Sitemap functionality has been added.
You can find all breaking changes needed in Migrating to 1.0.0.
A stable release is targeted for the first week of January.
Full Changelog: 0.4.0...1.0.0-beta.1