YITH WooCommerce Multi Vendor Premium 4.20.0

* New: Support to WooCommerce 3.9
* Update: Spanish language
* Dev: yith_wcmv_remove_role_for_vendor_admins hook to filter the vendor role to remove for vendor admins

* New: Support for WooCommerce 3.8
* New: Support for WordPress 5.3
* New: Support for WordPress 5.3
* New: Support for YITH WooCommerce Account Funds Premium 1.3.0
* New: Select whether to show the vendor's products during holiday closings in WooCommerce archive pages or not
* New: Bubble notification for Vendor's order
* Update: Italian language
* Update: Spanish language
* Update: Plugin framework
* Fix: Unexpected issue with WC_Eval_Math
* Fix: Unable to translate vendor name with WooCommerce Multilingual
* Fix: Unable to translate vendor name in taxonomy edit page with WPML
* Fix: Compatibility issue with YITH WooCommerce Booking (fixed availability issues on booking products)
* Fix: Vendor can see customer details in order preview
* Dev: yith_wcmv_skip_check_duplicate_term_name to skip check duplicated term name

* New: Support for WooCommerce 3.7
* New: Admin can create vendor's order from admin area
* New: Default store header image
* New: Filter by Vendors in products list tables
* New: Search commissions by order id
* Tweak: Add 'vendor_id' meta data in Vendor suborder
* Tweak: Add support for WC_Eval_Math for shipping cost
* Update: All language files
* Fix: Fatal error in single order and single commission page in admin area with WPML and WooCommerce Multilingual
* Fix: Style issues with Storefront theme
* Fix: Some style bugs in admin area
* Fix: Aelia Currency Switcher can't convert the vendor shipping cost
* Fix: Class YITH_Multi_Vendor_Shortcodes doesn't exists during ajax call
* Fix: Multiste support on vendor creation
* Dev: Add new hook yith_wcmv_send_vendor_quick_info_email
* Dev: Add new hook yith_wcmv_send_vendor_report_abuse_email
* Dev: Add new hook yith_wcmv_vendor_report_abuse_email_default_check
* Dev: Add new hook yith_wcmv_vendor_quick_info_email_default_check
* Dev: new parameter $yith_wc_email available for filter 'woocommerce_email_before_order_table' inside vendor emails
* Dev: Add new hook yith_wcmv_register_form_args