Update CHANGELOG.md with release notes from v0.2.1 (#28)

Update changelog

Author: u-simha

CHANGELOG.md

@@ -7,10 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- towncrier release notes start -->
 
+## [0.2.1] - 2026-07-02
+
+### Added
+
+- Support palettization of `ConvTranspose1d`/`ConvTranspose2d`/`ConvTranspose3d` layers via `KMeansPalettizer`
+- Support for `EAGER` execution mode in model inspection utility
+
+### Fixed
+
+- Fixed pruning mask `dtype` to match that of the weight being pruned
+- Fixes to allow better support for `bfloat16` `dtype` in palettization and quantization
+
 ## [0.2.0] - 2026-06-08
 
 ### Added
 
 - Initial release of `coreai-opt`. See the [GitHub Releases](https://github.com/apple/coreai-optimization/releases/) page for release notes.
 
+[0.2.1]: https://github.com/apple/coreai-optimization/releases/tag/v0.2.1
 [0.2.0]: https://github.com/apple/coreai-optimization/releases/tag/v0.2.0