Updated CHANGELOG.md

Author: victor5lm

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).
 
-## [2.3.1dev] - 2026-XX-XX : https://github.com/BU-ISCIII/buisciii-tools/releases/tag/2.3.1dev
+## [2.3.1] - 2026-02-26 : https://github.com/BU-ISCIII/buisciii-tools/releases/tag/2.3.1
 
 ### Credits