WooCommerce PDF Vouchers - WordPress Plugin 4.9.9

* [*] Fix: Improved code for adding additional Recipient field(s) such that new fields can be added easily with minimal coding. For more details check here.
WPWeb Documentation

* [*] Fix: Improved logic to record mail sent for Gift Notification email.

* [*] Fix: Resolved issue related to recipient gift date validation when no min / max date is selected.
* [*] Fix: Resolved an issue of sending broken voucher download link while
"Enable Voucher Code" is not checked at product level.