Add Rainbow in bin/pngquant

bin/pngquant

@@ -45,16 +45,16 @@ when 'lint'
   uncompressed_files = Parallel.map(files) do |file|
     is_uncompressed, _ = Tooling::Image.compress_image(file, true)
     if is_uncompressed
-      puts "Uncompressed file detected: ".color(:red) + file
+      puts Rainbow("Uncompressed file detected: ").red + file
       file
     end
   end.compact
 
   if uncompressed_files.empty?
-    puts "All documentation images are optimally compressed!".color(:green)
+    puts Rainbow("All documentation images are optimally compressed!").green
   else
     warn(
-      "The #{uncompressed_files.size} image(s) above have not been optimally compressed using pngquant.".color(:red),
+      Rainbow("The #{uncompressed_files.size} image(s) above have not been optimally compressed using pngquant.").red,
       'Please run "bin/pngquant compress" and commit the result.'
     )
     abort