Add changelog to readme.

Author: nerrad

readme.txt

@@ -84,6 +84,25 @@ Release and roadmap notes available on the [WooCommerce Developers Blog](https:/
 
 == Changelog ==
 
+= 5.8.0 - 2021-08-31 =
+
+#### Enhancements
+
+- Introduced the `__experimental_woocommerce_blocks_checkout_update_order_from_request` hook to the Checkout Store API. ([4610](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4610))
+- Add "Filter Products by Stock" block. ([4145](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4145))
+
+#### Bug Fixes
+
+- Prevent Product Category List from displaying incorrectly when used on the shop page. ([4587](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4587))
+- Add label element to `<BlockTitle>` component. ([4585](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4585))
+
+#### Documentation
+
+- Add Extensibility info to Store API readme. ([4605](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4605))
+- Update documentation for the snackbarNoticeVisibility filter. ([4508](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4508))
+- Add documentation for `extensionCartUpdate` method - this allows extensions to update the client-side cart after it has been modified on the server. ([4377](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/4377))
+
+
 = 5.7.1 - 2021-08-30 =
 
 #### Bug Fixes