Update changelog for 3.0.4

Author: kitchen-porter

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).
 
-## Unreleased
+## 3.0.4 - *2023-02-14*
 
 ## 3.0.3 - *2022-02-08*