changelog: Add entry

Author: jorisv

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Added
+- Add Eigen expression support to evaluate spatial algebra ([#2551](https://github.com/stack-of-tasks/pinocchio/pull/2551))
+
 ### Fixed
 - Fix mjcf Euler angle parsing: use xyz as a default value for eulerseq compiler option ([#2526](https://github.com/stack-of-tasks/pinocchio/pull/2526))
 - Fix aba explicit template instantiation ([#2541](https://github.com/stack-of-tasks/pinocchio/pull/2541))