Add lib/irb/color.rb to destribution file list

irb.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/ruby/irb"
   spec.license       = "BSD-2-Clause"
 
-  spec.files         = ["LICENSE.txt", "README.md", "exe/irb", "irb.gemspec", "lib/irb.rb", "lib/irb/cmd/chws.rb", "lib/irb/cmd/fork.rb", "lib/irb/cmd/help.rb", "lib/irb/cmd/load.rb", "lib/irb/cmd/nop.rb", "lib/irb/cmd/pushws.rb", "lib/irb/cmd/subirb.rb", "lib/irb/completion.rb", "lib/irb/context.rb", "lib/irb/ext/change-ws.rb", "lib/irb/ext/history.rb", "lib/irb/ext/loader.rb", "lib/irb/ext/multi-irb.rb", "lib/irb/ext/save-history.rb", "lib/irb/ext/tracer.rb", "lib/irb/ext/use-loader.rb", "lib/irb/ext/workspaces.rb", "lib/irb/extend-command.rb", "lib/irb/frame.rb", "lib/irb/help.rb", "lib/irb/init.rb", "lib/irb/input-method.rb", "lib/irb/inspector.rb", "lib/irb/lc/.document", "lib/irb/lc/error.rb", "lib/irb/lc/help-message", "lib/irb/lc/ja/encoding_aliases.rb", "lib/irb/lc/ja/error.rb", "lib/irb/lc/ja/help-message", "lib/irb/locale.rb", "lib/irb/magic-file.rb", "lib/irb/notifier.rb", "lib/irb/output-method.rb", "lib/irb/ruby-lex.rb", "lib/irb/ruby-token.rb", "lib/irb/slex.rb", "lib/irb/src_encoding.rb", "lib/irb/version.rb", "lib/irb/workspace.rb", "lib/irb/ws-for-case-2.rb", "lib/irb/xmp.rb"]
+  spec.files         = ["LICENSE.txt", "README.md", "exe/irb", "irb.gemspec", "lib/irb.rb", "lib/irb/cmd/chws.rb", "lib/irb/cmd/fork.rb", "lib/irb/cmd/help.rb", "lib/irb/cmd/load.rb", "lib/irb/cmd/nop.rb", "lib/irb/cmd/pushws.rb", "lib/irb/cmd/subirb.rb", "lib/irb/completion.rb", "lib/irb/context.rb", "lib/irb/color.rb", "lib/irb/ext/change-ws.rb", "lib/irb/ext/history.rb", "lib/irb/ext/loader.rb", "lib/irb/ext/multi-irb.rb", "lib/irb/ext/save-history.rb", "lib/irb/ext/tracer.rb", "lib/irb/ext/use-loader.rb", "lib/irb/ext/workspaces.rb", "lib/irb/extend-command.rb", "lib/irb/frame.rb", "lib/irb/help.rb", "lib/irb/init.rb", "lib/irb/input-method.rb", "lib/irb/inspector.rb", "lib/irb/lc/.document", "lib/irb/lc/error.rb", "lib/irb/lc/help-message", "lib/irb/lc/ja/encoding_aliases.rb", "lib/irb/lc/ja/error.rb", "lib/irb/lc/ja/help-message", "lib/irb/locale.rb", "lib/irb/magic-file.rb", "lib/irb/notifier.rb", "lib/irb/output-method.rb", "lib/irb/ruby-lex.rb", "lib/irb/ruby-token.rb", "lib/irb/slex.rb", "lib/irb/src_encoding.rb", "lib/irb/version.rb", "lib/irb/workspace.rb", "lib/irb/ws-for-case-2.rb", "lib/irb/xmp.rb"]
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]