Amend changelog with 8.4 support

Author: gsteel

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## 2.4.0
+
+### Added
+
+- Added support for PHP 8.4
+
 ## 2.3.2 - 2024-03-03
 
 ### Fixed