Release v0.0.13

SumUp Terminal for WooCommerce 0.0.13

Payment completion fix

• Prevents submitting the order-pay form from marking an unpaid order paid merely because a transaction ID was recorded when the terminal checkout started.
• Requires a stored SumUp checkout status of PAID or transaction status of SUCCESSFUL before completing an unpaid order; otherwise, displays an error that the terminal payment has not completed yet.
• Already-paid orders with a transaction ID continue to return success without completing payment again.