Version: 3.12.1
Misc - Update DomPDF library to v2.0.1
Fix - Fix a conflict with Ultimate Member that was causing issues when customizing voucher templates
* Fix - Replace deprecated usages of `is_ajax()` in favor of `wp_doing_ajax()`
* Misc - Require WooCommerce 3.9.4 or higher
Misc - Update DomPDF library to v1.0.2