Update CHANGELOG.md

Signed-off-by: Max Inden <[email protected]>

Author: mxinden

CHANGELOG.md

@@ -4,18 +4,14 @@ 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).
 
-## [0.22.4]
+## [0.22.3] - unreleased
 
 ### Added
 
 - Added `encode_registry` and `encode_eof` functions to `text` module.
   See [PR 205].
-
-[PR 205]: https://github.com/prometheus/client_rust/pull/205
-
-## [0.22.3] - unreleased
-
-### Added
+  
+  [PR 205]: https://github.com/prometheus/client_rust/pull/205
 
 - Support all platforms with 32 bit atomics lacking 64 bit atomics.
   See [PR 203].