WooCommerce Smart Coupons 8.20.1

* New: Introduction of background process for importing or bulk generation of coupons
* New: Search/Filter coupon's list by restricted email
* Fix: Call to undefined method WC_Coupon::get_meta() [WC 2.6.14 or lower]
* Fix: Import coupons from uploaded file on the server not working
* Fix: Support for coupon field 'Active for x payments' during auto/bulk coupon generation & import [WooCommerce Subscriptions 2.3.0+]
* Tweak: Disable autoload of few options
* Tweak: Loading of class for compatibility with WooCommerce Subscriptions
* Update: POT file

* Fix: Sometimes store credit is discounting double than it's actual amount on checkout page [WooCommerce AvaTax]
* Fix: WordPress database error Duplicate entry
* Fix: Store credit used data are not shown in order admin page if that store credit is deleted from the store (Thanks to: Jarrad Grigg)
* Fix: Coupon actions not working when a subscription product is in the cart [WooCommerce Subscriptions 2.3.4+]
* Tweak: Addition of product from coupon actions
* Tweak: Move checking of WooCommerce version from constructor to functions
* Tweak: Code Indentation
* Update: Initialization of Smart Coupons plugin
* Update: Number of arguments for hook 'woocommerce_coupon_is_valid'
* Update: Context for logging errors for Smart Coupons plugin
* Update: POT file

* New: Shortcode [wc_sc_available_coupons] to show available coupons on any page or post
* Fix: Sometimes while purchasing variable but fixed amount store credit, "Send coupons to..." section not visible on checkout page & also the coupons are not generated
* Fix: Theme's button style not applying on shop page for products which are created for purchasing credit
* Fix: Duplicate key error on inserting a value in table
* Fix: Coupons remain visible even after disabling the show on cart/checkout option
* Update: POT file