Update readme.txt for 10.9.0 release

Author: nielslange

readme.txt

@@ -81,6 +81,30 @@ Release and roadmap notes available on the [WooCommerce Developers Blog](https:/
 
 == Changelog ==
 
+= 10.9/0 - 2023-08-14 =
+
+#### Enhancements
+
+- Add the `wc-blocks-footer-pattern` class identifier to all footer patterns. ([10542](https://github.com/woocommerce/woocommerce-blocks/pull/10542))
+- Add the `wc-blocks-header-pattern` class identifier to all header patterns. ([10541](https://github.com/woocommerce/woocommerce-blocks/pull/10541))
+- Featured Products: Fresh & Tasty pattern: Enhance mobile view and optimize images. ([10521](https://github.com/woocommerce/woocommerce-blocks/pull/10521))
+- Add placeholder images and update text styles for the Alternating Image and Text pattern. ([10479](https://github.com/woocommerce/woocommerce-blocks/pull/10479))
+- Performance: Selecting shipping rates during checkout, and API calls in general, are now faster. Shipping selection improved by at least 1 second. ([10472](https://github.com/woocommerce/woocommerce-blocks/pull/10472))
+- Fixed wcSettings inconsistent property naming style by converting all properties to camelCase. ([10439](https://github.com/woocommerce/woocommerce-blocks/pull/10439))
+- Prevent a conflict with 3rd party plugins caused by using the session class too early. ([10373](https://github.com/woocommerce/woocommerce-blocks/pull/10373))
+- Product Collection: Use Interactivity API for pagination. ([10361](https://github.com/woocommerce/woocommerce-blocks/pull/10361))
+- Products: Fix the before/after shop item hooks. ([10332](https://github.com/woocommerce/woocommerce-blocks/pull/10332))
+- Checkout: Prevent postcode validation error notice appearing after pushing changes for other fields. ([10315](https://github.com/woocommerce/woocommerce-blocks/pull/10315))
+- Product Button block: Integrate Interactivity API to make the block dynamically. ([10006](https://github.com/woocommerce/woocommerce-blocks/pull/10006))
+
+#### Bug Fixes
+
+- Fix Express Payments buttons display in the Cart block. ([10534](https://github.com/woocommerce/woocommerce-blocks/pull/10534))
+- Fixed a bug which caused theme border colors to not correctly show on the blocks on the editor side. ([10468](https://github.com/woocommerce/woocommerce-blocks/pull/10468))
+- Fix: Compatibility layer issue when the Products (Beta) block is the top level block. ([10455](https://github.com/woocommerce/woocommerce-blocks/pull/10455))
+- Products (Beta): Hooks are no longer fired around the empty content. ([10453](https://github.com/woocommerce/woocommerce-blocks/pull/10453))
+- Fix an issue where inner Cart blocks were incorrectly nested. ([10447](https://github.com/woocommerce/woocommerce-blocks/pull/10447))
+
 = 10.8.3 - 2023-08-11 =
 
 #### Bug Fixes