This is the first release candidate for Asciidoctor 2.0.0. Once Asciidoctor 2.0.0 is released, the project will adhere to semantic versioning and only support versions of Ruby that themselves are in an active cycle. Only minor changes and bug fixes will be made between this version and the final release.
Consult the CHANGELOG for details about what's to expect in 2.0.0. The full release notes will be deferred until the final version is available.