fix(docs): update changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## Unreleased
+
+### Added
+
+- Extended the holdings endpoint to include the performance with currency effect for cash
+
 ## 2.226.0 - 2026-01-01
 
 ### Added
@@ -94,10 +100,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 2.221.0 - 2025-12-01
 
-### Added
-
-- Extended the holdings endpoint to include the performance with currency effect for cash
-
 ### Changed
 
 - Refactored the API query parameters in various data provider services