Update CHANGELOG.md

Author: SaridakisStamatisChristos

docs/CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format roughly follows [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).
 
-## [1.0.0] - 2024-03-01
+## [1.0.0] - 2025-10-08
 ### Added
 - Initial public release of the deterministic Python implementation of the KLL streaming quantile sketch.
 - Serialization helpers (`to_bytes` / `from_bytes`) with versioned binary framing (`KLL1`).