docs: add changelog for v1.1.3

Author: lappalainenj

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## [v1.1.3] - 2026-03-07
+
+### Bug Fixes
+- Fixed `umap_embedding` `NotFittedError` when fewer than two rows have nonzero variance
+- Fixed flash response index label alignment with filtered response index ordering
+- Fixed `EnsembleView` `FileNotFoundError` in example notebooks by using explicit `best_checkpoint_fn_kwargs`
+
+### Documentation
+- Added pretrained model download step to example notebooks
+- Updated installation documentation
+
+### Infrastructure
+- Updated package configuration in `pyproject.toml`
+
+[v1.1.3]: https://github.com/TuragaLab/flyvis/releases/tag/v1.1.3
+
 ## [v1.1.2] - 2024-12-09
 
 ### Infrastructure