Update CHANGELOG

Author: AVHopp

CHANGELOG.md

@@ -7,11 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 ### Added
 - Notebook on transfer learning
-- Notebook on chemical encodings
+- ~~Notebook on chemical encodings~~ See **Removed**
 - CODEOWNERS file
 - Notebook on reaction optimization
 - CI tests for execution of notebooks and changes in CHANGELOG
 - Basic description and infrastructure
+- Jupyter notebook version of the reaction optimization notebook
 
 ### Changed
 - Update from BayBE version 0.13.0 to 0.14.2
+
+### Removed
+- Notebook on chemical encodings was merged with notebook on reaction optimization