update changelog for release 53 [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]
+
+## [0.0.53-alpha] - 2021-08-01
 ### Fixed
 - Fix error message displayed after building empty playout
 - Fix Emby and Jellyfin links
@@ -534,7 +536,8 @@ 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/v0.0.52-alpha...HEAD
+[Unreleased]: https://github.com/jasongdove/ErsatzTV/compare/v0.0.53-alpha...HEAD
+[0.0.53-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.0.52-alpha...v0.0.53-alpha
 [0.0.52-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.0.51-alpha...v0.0.52-alpha
 [0.0.51-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.0.50-alpha...v0.0.51-alpha
 [0.0.50-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.0.49-prealpha...v0.0.50-alpha