2_1_0

Full Changelog: https://github.com/ruby/rdoc/commits/2_1_0

2_2_1

Full Changelog: https://github.com/ruby/rdoc/commits/2_2_1

2_2_0

Full Changelog: https://github.com/ruby/rdoc/commits/2_2_0

2_0_0

Full Changelog: https://github.com/ruby/rdoc/commits/2_0_0