Gem::Commands::SetupCommand#show_release_notes

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/commands/setup_command.rb, line 542
def show_release_notes
  ref = Gem::VERSION.include?(".dev") ? "master" : "v#{Gem::VERSION}"
  link = "https://github.com/ruby/rubygems/blob/#{ref}/CHANGELOG.md"

  previous = options[:previous_version].to_s.strip
  if previous.empty? || !Gem::Version.correct?(previous) ||
     Gem::Version.new(previous) >= Gem::Version.new(Gem::VERSION)
    say "See #{link} for the changes."
  else
    say "See #{link} for the changes since #{previous}."
  end
end