Made indentation properly

README.md

@@ -324,11 +324,11 @@ do this.
 ```ruby
 ```ruby
 class ActiveRecord::Base
 class ActiveRecord::Base
   has_attached_file :avatar
   has_attached_file :avatar
-# Validate content type
+  # Validate content type
   validates_attachment_content_type :avatar, :content_type => /\Aimage/
   validates_attachment_content_type :avatar, :content_type => /\Aimage/
-# Validate filename
+  # Validate filename
   validates_attachment_file_name :avatar, :matches => [/png\Z/, /jpe?g\Z/]
   validates_attachment_file_name :avatar, :matches => [/png\Z/, /jpe?g\Z/]
-# Explicitly do not validate
+  # Explicitly do not validate
   do_not_validate_attachment_file_type :avatar
   do_not_validate_attachment_file_type :avatar
 end
 end
 ```
 ```