WooCommerce Smart Coupons 9.18.0

* Fix: Expiry date is not being displayed in the coupon that is sent in the email
* Fix: Prevent the modification of the minimum & maximum amount during the purchase of credit of any amount from the browser
* Update: Additional arguments for filter 'wc_sc_is_auto_generate'
* Update: POT file

* New: Tested up to WooCommerce 5.0.0 & WordPress 5.6.2
* Fix: Expiry time is not being considered during coupon validation
* Fix: Generated store credit amount is not considering currency [Multi Currency for WooCommerce By VillaTheme]
* Fix: Sometimes the latest imported coupons are not getting activated if the code already exists
* Fix: Incorrect validation of the fields 'Product attributes' & 'Exclude attributes' under Coupon data > Usage restriction tab
* Fix: Validation based on product taxonomies not working if the taxonomy is related to the parent product
* Update: Use the date format of the website to display expiry date in the coupons
* Update: Added hook to control the number of attributes for field 'Product attributes' & 'Exclude attributes' under Coupon data > Usage restriction tab
* Update: Correction in a few PHPDocBlocks
* Update: POT file

* Fix: Product attributes restrictions are not getting copied in auto-generated coupons
* Fix: Coupons are not getting sent on renewals only in case of variable subscription
* Fix: Auto-apply coupons not working for 'Recurring Product % Discount' coupon if the sign up fee is 0 (zero)
* Update: POT file