Update attachment_size_validator.rb

Author: masterkain

Diff for: lib/paperclip/validators/attachment_size_validator.rb

@@ -29,7 +29,7 @@ def validate_each(record, attr_name, value)
           error_attrs << attr_name
         end
 
-        value = record.send(:read_attribute_for_validation, attr_name)
+        value = record.read_attribute_for_validation(attr_name)
 
         unless value.blank?
           options.slice(*AVAILABLE_CHECKS).each do |option, option_value|