Update changelog

an accident with IDE

Author: FranzBangar

CHANGELOG.md

@@ -4,6 +4,13 @@ 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).
 
+# [1.6.4]
+### Added
+- MappedSketch.merge() method
+
+### Changed
+- Improved blocking in cyclone example
+
 # [1.6.3]
 ### Changed
 - Bugfix: sorting of cells by sensitivity