Update CHANGELOG.md

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Upcoming - [3.16.0]
+## [3.16.0] ((2024-11-11))
 
 CityDoctor now supports the import, export and validation of CityGML 3.0 files.