Update CHANGELOG

Author: AVHopp

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - CI tests for execution of notebooks and changes in CHANGELOG
 - Basic description and infrastructure
 - Jupyter notebook version of the reaction optimization notebook
+- Jupyter notebook version of the transfer learning notebook
 
 ### Changed
 - Update from BayBE version 0.13.0 to 0.14.2