chore: prepare release 0.5.0

Update CHANGELOG.md with version 0.5.0 release notes including:
- Programmatic highlighting feature
- Vertical orientation support
- Vertical upset plot layout improvements and fixes

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: edmundmiller

CHANGELOG.md

@@ -9,6 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+### Changed
+
+### Fixed
+
+## [0.5.0] - 2025-11-17
+
+### Added
+
 - Programmatic highlighting via `highlight` parameter (`"least"`, `"greatest"`, index, or list of indices)
 - Vertical orientation support with new `orientation` parameter
   - Horizontal orientation (default): cardinality bars on top (vertical), set sizes on right (horizontal)
@@ -24,6 +32,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated component functions to support both horizontal and vertical orientations
 - Improved layout logic to handle orientation-specific rendering
 
+### Fixed
+
+- Improved vertical upset plot layout with consistent height ratios (0.6) and bar sizes (20px) matching horizontal orientation
+- Fixed set label circles being covered by bars in vertical orientation by separating labels into distinct components
+- Added proper Y-axis scale padding (0.1) to prevent matrix dots from being hidden behind set bars
+- Added 5px spacing between vertical plot components for better visual separation
+
 ## [0.4.0] - 2025-01-20
 
 ### Added