YITH WooCommerce Product Countdown Premium 1.37.0

New: Support to WooCommerce 3.3.0

• New: Dutch translation
• Update: countdown library
• Update: plugin framework
• Tweak: script loading moved to footer
• Fix: shortcode lightbox not working

New: counter supporting countdown over 100 days
New: Support to WooCommerce 3.2.0 RC2
Update: plugin framework
Fix: countdown not displayed id Pre-Order item in out of stock