prepare changelog for new version

Author: KarnerTh

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) (after version 0.0.5).
 
-## [0.12.0] - 2024-0
+## [0.12.0] - 2024-11-10
 ### Added
 - new `--outputMode` option ([PR #63](https://github.com/KarnerTh/mermerd/pull/63))