prepare release

Author: dbu

Diff for: CHANGELOG.md

@@ -1,4 +1,4 @@
-# Change Log
+# Changelog
 
 
 All notable changes to this project will be documented in this file.
@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [1.15.0] - 2023-05-10
 
+**If you use the decorator classes, you might need to adjust your code to the parameter and return type declarations added in PSR-7**
+
 - Actually make compatible with PSR-7 1.1 and 2.0
 - Drop support for PHP 7.1