* New: Support to WooCommerce 3.7.
* Update: Plugin Core.
* Update: Language files.
* Fix: Availability date of variations wasn't being updated when "Automatic Pre-Order status" option is activated.
* New: Support to WordPress 5.2.x
* Update: Plugin Core.
* Update: Language files.
* Fix: When "No date message" option was empty, the string "false" was displayed on Pre-Order variations with no availability date.
