Update changelog with 1.0.0 release

Author: pcisar

python/CHANGELOG.md

@@ -1,10 +1,10 @@
 # Change Log
 All notable changes to this project will be documented in this file.
- 
+
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased] - yyyy-mm-dd
+## [1.0.0] - 2023-10-03
 
 ### Changed