$this can no longer be used in a plain function or method since PHP 7.1

Hi,

PHP Compatibility Checker (Target PHP Ver. 7.2) gave me the following error alert for the latest version of this plugin.

File Name:
custom-content-shortcode\includes\modules\attached.php
The problem code (Line 70):
usort($attachment_ids, array($this, ‘sort_gallery_by_title’));
Type:
Error
Message:
\$this\” can no longer be used in a plain function or method since PHP 7.1.”

The previous version of this plugin had same errors in custom-content-shortcode\includes\core\content.php too, but those seem already fixed in the latest version. Would there be any update plan to fix this error too?

Thanks,