Update changelog

Author: pinin4fjords

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Enhancements & fixes
 
 - [PR #1480](https://github.com/nf-core/rnaseq/pull/1480) - Bump version after release 3.18.0
+- [PR #1482](https://github.com/nf-core/rnaseq/pull/1482) - Update trimgalore module for save_unpaired fix
 
 # 3.18.0 - 2024-12-19