YITH WooCommerce Customer History Premium 1.23.0

* New: Support for WooCommerce 4.0
* New: Latest Customer Orders list in order editor page
* Update: YIT Plugin Framework
* Fix: Minor bugs

* New: Support for WordPress 5.3
* New: Support for WooCommerce 3.8
* New: Feature to show the orders SKU
* New: Filters to hide customers columns
* Update: YIT Plugin Framework* Fix: Customer search by display_name
* Fix: Minor bugs

* New: WooCommerce 3.7 support
* Update: YIT Plugin Framework
* Fix: DB queries syntax
* Fix: Not all user orders visible
* Fix: Refunded orders calculation
* Fix: Minor bugs