update changelog

Author: johanneskoester

CHANGELOG.md

@@ -2,6 +2,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.34.0] - 2020-11-13
+### Added
+- Ability to set minimum refetch distance in `bam::RecordBuffer`.
+
 ## [0.33.0] - 2020-11-04
 ### Changes
 - BREAKING: Rename feature 'serde' as 'serde_feature' (for technical reasons)