adding changelog entry

Author: BSd3v

CHANGELOG.md

@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#3264](https://github.com/plotly/dash/pull/3264) Fixed an issue where moving components inside of children would not update the `setProps` path, leading to hashes being incorrect
 - [#3265](https://github.com/plotly/dash/pull/3265) Fixed issue where the resize of graphs was cancelling others
 
+## Added
+- [#3268](https://github.com/plotly/dash/pull/3268) Added the ability for component devs to subscribe to descendent updates by setting `childrenLayoutHashes = true` on the component, eg: `Tabs.childrenLayoutHashes = true`
 
 ## [3.0.2] - 2025-04-01