Add the changelog to readme.txt

Author: tarhi-saad

readme.txt

@@ -86,6 +86,24 @@ Release and roadmap notes available on the [WooCommerce Developers Blog](https:/
 
 == Changelog ==
 
+= 8.4.0 - 2022-08-29 =
+
+#### Enhancements
+
+- Update the filter `Apply` buttons to match the new designs. ([6958](https://github.com/woocommerce/woocommerce-blocks/pull/6958))
+- Update the design of the Filter Products by Attribute block. ([6920](https://github.com/woocommerce/woocommerce-blocks/pull/6920))
+- Update the design of the Filter by Attribute block settings panel. ([6912](https://github.com/woocommerce/woocommerce-blocks/pull/6912))
+- Terms and conditions, and Privacy policy links open in a new tab by default. ([6908](https://github.com/woocommerce/woocommerce-blocks/pull/6908))
+- Layout updates to the Active Filters block. ([6905](https://github.com/woocommerce/woocommerce-blocks/pull/6905))
+- Update the design of the Filter Products by Stock block. ([6883](https://github.com/woocommerce/woocommerce-blocks/pull/6883))
+- Update the design of the Filter Products by Price block. ([6877](https://github.com/woocommerce/woocommerce-blocks/pull/6877))
+- Allow making the Cart/Checkout block page the default one from within the editor. ([6867](https://github.com/woocommerce/woocommerce-blocks/pull/6867))
+- Register product search as a core/search variation when available. ([6191](https://github.com/woocommerce/woocommerce-blocks/pull/6191))
+
+#### Bug Fixes
+
+- Fixed a bug with a class name deriving from a translatable string. ([6914](https://github.com/woocommerce/woocommerce-blocks/pull/6914))
+
 = 8.3.1 - 2022-08-17 =
 #### Bug Fixes