Update CHANGELOG.md

Author: cicirello

CHANGELOG.md

@@ -4,14 +4,15 @@ 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).
 
-## [Unreleased] - 2023-03-05
+## [Unreleased] - 2023-03-07
 
 ### Added
 
 ### Changed
 * Minor code improvements to Permutation and PermutationIterator classes.
 * Minor code improvements to KendallTauDistance and WeightedKendallTauDistance.
 * Minor code improvements to CyclicEdgeDistance and CyclicRTypeDistance.
+* Refactored SequenceSamplers.
 
 ### Deprecated