added date for 1.0.0

Author: blutsvente

CHANGELOG.md

@@ -4,7 +4,6 @@ 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).
 
-## [1.0.0] - to be released
+## [1.0.0] - 2023-01-05
 ### Added
 - Initial release
-