Update changelog

Author: Tatiana Gelaf Romer

CHANGELOG.md

@@ -3,6 +3,12 @@
 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]
+
+### Features
+
+- Update to cellranger v10.0.0 ([#508](https://github.com/nf-core/scrnaseq/pull/508))
+
 ## v4.1.0 - 2025-08-01
 
 ### Features