Unused mandatory method argument 'should_type_cast'

https://github.com/Paxa/light_record/blob/490396eaf46ce60686d3a33f683b3395bd83c9e3/lib/light_record.rb#L79
```
def write_attribute_with_type_cast(attr_name, value, should_type_cast)
        @attributes[attr_name.to_sym] = value
      end
```
The argument ```should_type_cast``` is a mandatory method argument, but it's not used.