Add CHANGELOG notes for v0.4.0

Author: jacobcassidy

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/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0] - 2025-01-31
+
+### Added
+
+- Added sheild.io badges to top of `README.md`.
+
 ## [0.3.0] - 2025-01-07
 
 ### Added