WooCommerce Smart Coupons 8.20.1

* New: Set a max discount amount for percentage discount type coupon
* New: Feature to allow store admin to set expiry time for coupon [WC3.2+]
* Update: POT file

* New: Feature to allow buyers to schedule delivery of coupons
* New: WooCommerce 3.7 Compatibility
* Fix: Import Coupon CSV not working [WC3.7]
* Fix: Smart Coupons' setting not saving [WC3.7]
* Fix: PHP Notice: get_used_coupons is deprecated [WC3.7]
* Fix: Coupon bulk export/import performance
* Fix: Incorrect price showing in Receiver detail form when selling of credit at less price is enabled
* Update: A few changes in CSS
* Update: Responsiveness of "Email to customer" description under WooCommerce > Coupons > Bulk Generate tab
* Update: Alignment of amount field in template 'call-for-credit-form.php'
* Update: POT file

* Fix: Fatal Error: Could not find class 'ActionScheduler'
* Fix: Incorrect Subscription renewal order total when using a coupon having option 'Add products to cart' is used
* Fix: Store credit charged but discount is not applied to order when registering a user and placing the order both at the same time from the checkout page
* Fix: Store credit becomes 0 on checkout when WooCommerce Services plugin's 'Automated Taxes' setting is enabled
* Fix: Store credit not being reduced when customer places failed order and later order status is changed to on-hold/processing/completed
* Update: Welcome page CSS
* Update: POT file