Update CHANGELOG.md

Author: pinin4fjords

CHANGELOG.md

@@ -23,6 +23,7 @@ Thank you to everyone else that has contributed by reporting bugs, enhancements
 - [PR #1054](https://github.com/nf-core/rnaseq/pull/1054) - Template update to nf-core/tools v2.9
 - [PR #1058](https://github.com/nf-core/rnaseq/pull/1058) - Use `nf-validation` plugin for parameter and samplesheet validation
 - [PR #1068](https://github.com/nf-core/rnaseq/pull/1068) - Update `grep` version for `untar` module
+- [PR #1073](https://github.com/nf-core/rnaseq/pull/1073) - Update documentation to discourage --genome
 
 ## [[3.12.0](https://github.com/nf-core/rnaseq/releases/tag/3.12.0)] - 2023-06-02