* Dev - Add linting, unit and e2e test coverage within GitHub Actions. * Add - Support for High-performance Order Storage ("HPOS") (formerly known as Custom Order Table, "COT").
* Fix - Bug that would hide Go Cardless when WooCommerce Pre-Orders was active * Tweak - WP tested up to 5.8. * Tweak - WC tested up to 6.0
* Fix - Customers are charged when changing payment method on a subscription. * Tweak - WP tested up to 5.3. * Tweak - WC tested up to 3.8
