Update CHANGELOG.md for version 0.4.0

Author: illagrenan

CHANGELOG.md

@@ -6,14 +6,22 @@ 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).
 
-## [0.3.1] - 2025-10-XX
+## [0.4.0] - 2025-12-07
 
-[:material-github: Github release](https://github.com/illagrenan/django-brotli/releases/tag/v0.3.1)
+[:material-github: Github release](https://github.com/illagrenan/django-brotli/releases/tag/v0.4.0)
 
 ### Added
 
 - Add support for Python 3.14.
-- Add support for Django 5.2, 6.0.
+- Add support for Django 6.0.
+
+### Changed
+
+- Updated CI workflows to use pipx for Poetry installation to fix Python 3.13+ compatibility.
+
+### Credits
+
+- Thanks to [@axsapronov](https://github.com/axsapronov) for contributions to this release.
 
 
 ## [0.3.0] - 2024-12-11