Fix typo: Debug puts

lib/tasks/thumbnail.rake

@@ -29,8 +29,7 @@ namespace :thumbnail do
         offset = offset + limit
 
         items.each do |item|
-          puts item.name
-          # ThumbnailGeneratorWorker.perform_async(item.id)
+          ThumbnailGeneratorWorker.perform_async(item.id)
         end
 
       end