Added entry to CHANGELOG.md

Author: MrTeale

CHANGELOG.md

@@ -2,6 +2,12 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [2.3.2]
+
+### Added
+
+- [#2009](https://github.com/plotly/dash/pull/2009) Add support for Promises within Client-side callbacks as requested in [#1364](https://github.com/plotly/dash/pull/1364).
+
 ## [2.3.1] - 2022-03-29
 
 ### Fixed