docs: add changes for upcoming version

Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>

Author: boesing

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.3.0] - TBD
 
+### Added
+
+- Support for `psr/http-message` v2
+
 ## [1.2.0] - 2022-12-01
 
 ### Added