update changelog

Author: Gianlucamilani

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- The capability to provide "ik-solution-link-orientation" and "target-imu-orientation" as quantities (https://github.com/ami-iit/component_human-biomechanics/issues/47)
 - The HumanIK class (https://github.com/ami-iit/biomechanical-analysis-framework/pull/15)
 - The `CHANGELOG.md` file
 - The `Logging` feature (https://github.com/ami-iit/biomechanical-analysis-framework/pull/10)
+