Prepare for releasing v0.4.0

Author: segevfiner

CHANGELOG.md

@@ -4,7 +4,7 @@ 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
+## 0.4.0 - 2022-12-02
 ### Changed
 - The binary of the crate is now behind the feature `bin` so users of the library crate bring in
   less dependencies.