* Changed: allow sequence definitions for ActiveRecord primary keys (Mike Burns). * Changed: Support Ruby 3.0+, Rails 6.1+ (Mike Burns) * Documentation improvements (obregonia1). * Internal: GitHub Actions improvements (Lorenzo Zabot, ydah). * Internal: RubyGems points to changelog (Tilo Sloboda). * Internal: Bump standard, rake, activerecord, appraisal, rspec-rails (Mike Burns).