update CHANGELOG

CHANGELOG.md

@@ -7,8 +7,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 
 ### Added
+
+- Add more general visitor `GenericMapPythonVisitor` for map types ([#504](https://github.com/stack-of-tasks/eigenpy/pull/504)), test `boost::unordered_map<std::string, int>`
 - Add type_info helpers ([#502](https://github.com/stack-of-tasks/eigenpy/pull/502))
 
+### Changed
+
+- Move `StdMapPythonVisitor` out of `eigenpy::python` namespace, which was a mistake ([#504](https://github.com/stack-of-tasks/eigenpy/pull/504))
+
 ## [3.9.0] - 2024-08-31
 
 ### Changed