Update CHANGELOG.md

CHANGELOG.md

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 ## [Unreleased]
 
-- 
+### Added
+- **Support more AnnData fields**, additional API for accessing, modifying and deleting fields: `layers`, `obsm`, `varm`, `obsp`, `varp` was added.([#22](https://github.com/cellannotation/cap-anndata/pull/22), [#26](https://github.com/cellannotation/cap-anndata/pull/26)) 
+- **String representation** for `CapAnnData` objects. ([#24](https://github.com/cellannotation/cap-anndata/pull/24))
+- **Deprecation warnings** for `read_directly` function. ([#25](https://github.com/cellannotation/cap-anndata/pull/25)). It is recommended to use `read_h5ad` instead.
+
+### Removed
+- **`CapAnnDataUns` class** removed and replaced with the new `CapAnnDataDict` class.
+- **`test_backed_uns.py` test file** deleted, superseded by tests for `CapAnnDataDict`.
+
+### Changed
+- **Dependencies updated** in `setup.py` and `requirements.txt` to relax version constraints and fix issues. ([#23](https://github.com/cellannotation/cap-anndata/pull/26))
+- **Internal implementation** `CapAnnDataUns` was renamed to `CapAnnDataDict`.
+
 ## [v0.2.2] - 2024-08-28
 
 ### Added