Update changelog for RDKit InChI/InChIKey conversions

Author: Copilot

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [0.5.1] - 2026-05-07
 ### Added
 - Added high-level functions also for canonical smiles [#178](https://github.com/RECETOX/MSMetaEnhancer/pull/178)
+- Added `smiles_to_inchi`, `smiles_to_inchikey`, and `inchi_to_inchikey` conversions to the RDKit converter [#179](https://github.com/RECETOX/MSMetaEnhancer/pull/179)
 
 ## [0.5.0] - 2026-03-10