Prepare for release

Author: alessiostalla

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project from version 0.4.0 upwards are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [0.9.1] – Not yet released
+## [0.9.1] – 2025-09-19
 
 ### Added
 - Include the source in ANTLR parse errors, if available