Add 0.4.0 to changelog

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]
+## [0.4.0] - 2024-04-22
 
 ### Added
 
@@ -32,7 +32,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- **BREAKING**: Ensure that location includes trailing slash if app is being served from subdirectory (see README for sample configuration)
+- **BREAKING**: Location must include trailing slash if app is being served from subdirectory (see README for sample configuration)
 - Design of training session page
 - Design of routine page
 - List routines sorted by last use
@@ -100,7 +100,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial version of web app
 
-[Unreleased]: https://github.com/treiher/valens/compare/v0.3.0...HEAD
+[0.4.0]: https://github.com/treiher/valens/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/treiher/valens/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/treiher/valens/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/treiher/valens/compare/1b1733763a5f904886da9d49ea545a527f11e17f...v0.1.0