Correct changelog/prep changelog for next release.

changelog.txt

@@ -1,10 +1,12 @@
 *** WooCommerce Subscriptions Core Changelog ***
 
+= 8.0.0 - xxxx-xx-xx =
+* Fix - Prevents the customer's postal code being used as their billing city in the current session, following a change to payment details.
+
 = 7.9.0 - 2025-01-10 =
 * Add - Compatibility with WooCommerce's new preview email feature introduced in 9.6.
 * Fix - Prevent payment gateways that complete Change Payment requests asynchronously from blocking future attempts to update payment methods for all subscriptions.
 * Fix - Resolved an issue that could lead to undefined variable when attempting to send a customer notification email with no order.
-* Fix - Prevents the customer's postal code being used as their billing city in the current session, following a change to payment details.
 * Fix - Safeguards added to the Subscriptions Totals template used in the My Account area, to guard against fatal errors that could arise in unusual conditions.
 * Dev - Use the subscription's customer ID during the `wcs_can_user_renew_early()` function call when sending customer notification emails.
 * Dev - Fix PHP deprecated warnings caused by calling esc_url with null.