Update CHANGELOG.md

Author: isc-tleavitt

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [4.0.4] - Unreleased
+## [4.0.4] - 2024-10-15
 
 ### Fixed 
 - #54: Defend against possible configuration-dependent SQL exceptions in mapping INT to MAC/CLS coverage