* Feature - Declare compatibility with WooCommerce High-Performance Order Storage (HPOS).
* Tweak - Added links to the plugin settings, the documentation page, and to get support, in the plugin list.
* Tweak - Updated plugin author.
* Tweak - Updated plugin text domain.
* Tweak - Tested compatibility up to WC 7.7.
* Tweak - Tested compatibility up to WP 6.2.
* Dev - Implement the singleton pattern in the main plugin class.
* Dev - Updated the minimum requirements to WC 3.5, WP 4.7, and PHP 5.4.
