Update changelog

Author: cmd-ntrf

CHANGELOG.md

@@ -3,7 +3,18 @@ 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/).
 
-## [15.1.0] UNRELEASED
+## [15.2.0] UNRELEASED
+
+### Added
+-
+
+### Changed
+-
+
+### Removed
+-
+
+## [15.1.0] 2025-11-28
 
 ### Added
 - Document the optional features attribute to instances (PR #389)