v3.5.7 = Release Date: January 27th, 2020
* [Added] Product Variation column: Tax Class
* [Added] Product Variation column: Shipping Class
* [Added] Default Form Values column
* [Added] Correct export for the First and Last Order column on the User list page
* [Fixed] Make it possible to set a Shipping Class with editing when there is not yet a class set
* [Fixed] Smart Filtering for the column Coupons Used did not work correctly
* [Fixed] Smart Filtering drop-down box now searches correctly for the Product Taxonomy column on the Product Variation list table
