Update the changelog

Author: CNFeffery

CHANGELOG.md

@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## Fixed
 
 - [#2994](https://github.com/plotly/dash/pull/2994) Keep generated doc-string order for shape or exact props. Fixes [#2990](https://github.com/plotly/dash/issues/2990)
+- [#3011](https://github.com/plotly/dash/pull/3011) Fixed an exception error caused by assigning `None` to array properties with `exact` or `shape` element types. Fixes [#3010](https://github.com/plotly/dash/issues/3010)
 
 ## [2.18.1] - 2024-09-12