YITH WooCommerce Subscription Premium 3.9.0

New: Support to WooCommerce 3.6.0 RC1
Update: Plugin Core 3.1.28
Update: Language files
Update: Translation for the string 'Cancel subscription now'
Fix: Set order_args in WooCommerce session, to fix Stripe issue
Fix: Coupon amount
Fix: Numeric issues
Dev: Added filter 'ywsbs_use_date_format'

Update: Plugin Core 3.1.21
Update: Language files
Fix: Subscription status translation
Fix: Fixed typo
Fix: Subscription field show if check virtual or downloadable checkbox at first time
Fix: Check if subscription has renews in the payment done email
Fix: Recurring payment total in renew order email

Update: Plugin Core 3.1.17
Update: Language files
Tweak: added check if order contains subscriptions to not execute ywcsb_after_calculate_totals
Fix: Fixed possible error under specific conditions
Fix: Fixed add to cart validation
Fix: $max_lenght array with localized index,
Fix: Fixed a non numeric value on max_lenght field
Fix: Fixed recurrent coupon on variation
Dev: Added the filter 'ywsbs_register_panel_position'