save and add changelog

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [dev]
+
+### Added
+
+### Changed
+
+- [#855](https://github.com/nf-core/sarek/pull/855) - Speed up duplicate marking by using `samtools` for CRAM conversion
+
+### Fixed
+
+- [#851](https://github.com/nf-core/sarek/pull/851) - Fix `schema` definition `None` for `cf_chrom_len`
+
+### Deprecated
+
+### Removed
+
+### Dependencies
+
 ## [3.1](https://github.com/nf-core/sarek/releases/tag/3.1) - Rapaätno
 
 Rapaätno is the river you can see from the Skierfe mountain.