docs: update CHANGELOG

Author: StrangeRanger

hardening/UFW Cloudflare/CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v1.0.4 - 2026-05-21
+
+### Fixed
+
+- Replaced the use of `exit 1` with `clean_exit 1` to ensure temp files are removed on exits.
+
 ## v1.0.3 - 2026-05-21
 
 ### Added