added version number to publish latest change (np.nan fix)

Author: kaseylove

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.x.y] - 2024-nn-yy
+## [0.5.1] - 2025-02-01
 ### Modified
 - Switched to using `np.nan` instead of `np.NaN` to be compatible with Numpy 2.0