update changelog

Author: pinin4fjords

CHANGELOG.md

@@ -38,6 +38,8 @@ Special thanks to the following for their contributions to the release:
 - [PR #1558](https://github.com/nf-core/rnaseq/pull/1558) - Remove patches and bump modules for ARM compat
 - [PR #1560](https://github.com/nf-core/rnaseq/pull/1560) - General modules update, include updating subworkflows for stats fixes
 - [PR #1563](https://github.com/nf-core/rnaseq/pull/1563) - Version bumps ahead of 3.19.0 release
+- [PR #1565](https://github.com/nf-core/rnaseq/pull/1565) - Improve reproducibility with Conda
+
 
 # 3.18.0 - 2024-12-19