YITH WooCommerce Added to Cart Popup Premium 2.17.0

* New: Support to WooCommerce 3.7.0 RC
* Update: Italian language
* Update: Plugin Core

* New: Compatibility with WooCommerce Min/Max Quantities
* Update: Plugin Core
* Update: Language files
* Update: Italian translation

* New: support to WooCommrce 3.6.4
* New: support to WordPress 5.2.1
* New: plugin fw 3.2.1
* Update: language files
* Dev: new filter 'yith_ywgc_get_gift_card_price'
* Fix: Call to a member function get_image() on boolean