* Feature - Declared compatibility with WooCommerce High-Performance Order Storage (HPOS).
* Tweak - Added links to the plugin settings page, the documentation page and to get support, in the plugin list.
* Tweak - Use the `jquery.cookie.js` library version bundled with WooCommerce.
* Tweak - Updated plugin author.
* Tweak - Updated plugin textdomain.
* Tweak - Tested compatibility up to WC 7.7.
* Tweak - Tested compatibility up to WP 6.2.
* Dev - Use SASS instead of LESS for generating the CSS styles.
* Dev - Implement the singleton pattern in the main plugin class.
* Dev - Updated minimum requirements to WC 3.5, WP 4.7 and PHP 5.4.
