update date

Author: ksh-b

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).
 
-## [0.12.0] - ???
+## [0.12.0] - 2024-05-24
 
 ### Added
 - Option to choose translator instance