YITH WooCommerce Multi-step Checkout Premium 2.31.0

• Update: Plugin core framework version 3
• Fix: Checkout fields validation doesn't works for not logged in users

• New: Enable the My Account login/register form in login step instead of "Returning Customer" form
• Tweak: Replace the jQuery.size() with the jQuery.length in frontend script
• Fix: ScrollTop doesn't works with latest WooCommerce version (3.2.x)

New: Support for WooCommerce 3.2
New: Add support for WooCommerce Amazon Payments plugin
New: 100% Dutch translation
Fix: Double timeslot box with Delivery Date Plugin