Update changelog

Author: pinin4fjords

CHANGELOG.md

@@ -14,6 +14,7 @@ Special thanks to the following for their contributions to the release:
 ### Enhancements & fixes
 
 - [PR #1597](https://github.com/nf-core/rnaseq/pull/1597) - Bump version after release 3.20.0
+- [PR #1603](https://github.com/nf-core/rnaseq/pull/1603) - Add bam input pathway
 
 ## [[3.20.0](https://github.com/nf-core/rnaseq/releases/tag/3.20.0)] - 2025-08-18