update changelog for release v0.4.0-alpha [no ci]

CHANGELOG.md

@@ -4,6 +4,8 @@ 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/).
 
 ## [Unreleased]
+
+## [0.4.0-alpha] - 2022-01-29
 ### Fixed
 - Fix m3u `mode` query param to properly override streaming mode for all channels
   - `segmenter` for `HLS Segmenter`
@@ -943,7 +945,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Initial release to facilitate testing outside of Docker.
 
 
-[Unreleased]: https://github.com/jasongdove/ErsatzTV/compare/v0.3.8-alpha...HEAD
+[Unreleased]: https://github.com/jasongdove/ErsatzTV/compare/v0.4.0-alpha...HEAD
+[0.4.0-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.3.8-alpha...v0.4.0-alpha
 [0.3.8-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.3.7-alpha...v0.3.8-alpha
 [0.3.7-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.3.6-alpha...v0.3.7-alpha
 [0.3.6-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.3.5-alpha...v0.3.6-alpha