* Tweak - Added compatibility with WooCommerce High-Performance Order Storage.
* Tweak - Added links to the documentation page and to get support in the plugin list.
* Tweak - Updated plugin author.
* Tweak - Tested compatibility up to WC 7.4.
* Tweak - Tested compatibility with WP 6.1.
* 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