Update: Spanish language
Update: Italian language
Update: Plugin Core 3.0.16
Dev: Added new filter 'ywcas_extend_to_sku_before_query'
Fix: Clear strings that start with '-' minus character
Fix: Search for Sku
New: Support to WordPress 4.9.6 RC2
New: Support to WooCommerce 3.4.0 RC1
New: Option to exclude Out of stock products
Update: Plugin Core 3.0.15
Fix: meta_key search ordering
Fix: reverse string search
New: Support to WooCommerce 3.3.x
Dev: New filter 'yith_wcas_ajax_search_products_posts_per_page'
Dev: New filter 'ywcas_show_not_visible'
Update: Plugin Core 3.0.11
