Update CHANGELOG to v0.1.0

CHANGELOG.md

@@ -4,8 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+_Nothing yet_
+
+## [0.1.0] - 2023-03-02
 ### Added
 - Initial Python API, with `is_gellermann_series`, `generate_gellermann_series`, `generate_all_gellermann_series`, and `generate_gellermann_series_table`
 - Basic GUI, with PyInstaller-generated standalone executables for Linux, macOS, and Windows
 
-[Unreleased]: https://github.com/YannickJadoul/PyGellermann/compare/e013a30...HEAD
+[0.1.0]: https://github.com/YannickJadoul/PyGellermann/compare/v0.1.0...HEAD
+[Unreleased]: https://github.com/YannickJadoul/PyGellermann/compare/e013a30...v0.1.0