WooCommerce Smart Coupons 9.18.0

* Fix: Discount not applied on taxes from AvaTax with Apply before tax setting disabled
* Fix: 'Select options' button not visible for any amount gift certificate product on shop page after adding the gift certificate product into the cart
* Fix: Adding sender email to 'woocommerce_email_header' and 'woocommerce_email_footer' actions while sending an acknowledgment email to sender[WC Standard]
* Fix: Duplicate call to WC_SC_Background_Coupon_Importer::is_process_running in some cases
* Developer: Filter 'wc_sc_linked_coupon_text' to change the text shown for linked coupons on linked product page
* Developer: Filter 'wc_sc_force_show_invalid_coupon' to allow showing of coupons which are invalid due to cart requirements like minimum order total or products
* Developer: Action 'wc_sc_no_available_coupons' to show custom message when no coupons are available for logged-in user
* Tweak: Removing dependency on Action Scheduler library in checking of background process status
* Update: POT file

* New: WooCommerce 3.8.1 compatible
* Fix: Variable gift certificate product price not displaying in product description when variation is not discounted and 'Sell store credit at less price' is enabled

* New: Restrict Coupons by Product Attributes
* New: Setting to change endpoint for Coupons. The endpoint will appear in the URL when the customer is on My Account > Coupons page
* Fix: Emails not getting sent in some cases
* Fix: Email template override not working
* Fix: JavaScript error: Undefined 'woocommerce_admin_meta_boxes_coupon'
* Fix: Incorrect email preview layout under WooCommerce > Coupons > Send Store Credit tab
* Fix: Replacing usage of 'wc_selected' function with 'selected' function for better backward compatibility
* Update: Documentation links
* Update: POT file