Update changelog

Author: Sephster

CHANGELOG.md

@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - Basic authorization is now case insensitive (PR #1403)
 
+### Changed
+- Request parameters are now parsed into strings to use internally in the library (PR #1402)
+
 ## [9.0.0-RC1] - released 2024-03-27
 ### Added
 - Device Authorization Grant added (PR #1074)