Prepare changelog for v3.19

CHANGELOG.md

@@ -5,6 +5,14 @@ All notable changes to this library 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).
 
+## [v3.19.0](https://github.com/NexusPHP/cs-config/compare/v3.18.0...v3.19.0) - 2023-12-29
+
+- Bump minimum PHP version to PHP 8.1
+- Bump to php-cs-fixer v3.43
+- Run build on PHP 8.3
+- Bump to phpunit v10.5
+- Fix sample ruleset in README
+
 ## [v3.18.0](https://github.com/NexusPHP/cs-config/compare/v3.17.0...v3.18.0) - 2023-10-13
 
 - Bump to php-cs-fixer v3.35