YITH WooCommerce Minimum Maximum Quantity Premium 1.39.0

* New: support for WooCommerce 5.3
* Update: YITH plugin framework

* New: support for WordPress 5.7
* New: support for WooCommerce 5.1
* Update: YITH plugin framework

* New: Support for WooCommerce 4.5
* Update: plugin framework
* Fix: add to cart from shop and archive pages now starts from minimum quantity (if set)
* Fix: wrong product quantity error message
* Fix: quantity check for categories and tags when using YITH Request a Quote