Project:Ruby/Ruby 2.0 deprecation
From Gentoo Wiki
Upstream support for Ruby 2.0 has ended on 24th February 2016.
- Get ruby21 package coverage up to the same level as ruby19
- Stabilize packages with ruby21 support
- Default Ruby target for new installs to ruby21
- Package.mask and remove ruby20-only packages
For further information please also check https://bugs.gentoo.org/show_bug.cgi?id=576034