YITH WooCommerce Composite Products Premium 1.30.0

* New: Downloadable composite product options
* Fix: Problem discount with YITH Popup
* Fix: Fatal error after update
* Fix: Undefined index discount norice
* Fix: Minor bugs

• New: WordPress 4.9.6 support
• New: WooCommerce 3.4 support
• New: Support to GDPR compliance
• New: Composite Product "Virtual" option
• Update: YIT Plugin Framework 3.0.12
• Update: Dutch language
• Update: Italian language
• Fix: Composite Products weight calculation
• Fix: Warning adding a composie product with "no" weigth
• Fix: Component quantity input in cart if is null
• Fix: Prevent customers from changing quantity in cart when fixed price
• Fix: Minor bugs

New: WordPress 4.9.2 support
New: WooCommerce 3.3.x support
Update: YIT Plugin Framework 3.0.12
Dev: New "ywcp_hide_outofstock_components" filter
Dev: New "yith_wcp_composite_children_subtotal filter
Dev: New "yith_wcp_price_updated" trigger
Fix: Discounted variable component price in minicart
Fix: Minor bugs