io/console: drop 2.0.0 support [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62631 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io/console: drop 2.0.0 support [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62631 b2dd03c8-39d4-4d8f-98ff-823fe69b080e