Update CHANGELOG.md

Author: cicirello

CHANGELOG.md

@@ -9,10 +9,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### 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.
+* Minor code improvements and/or optimizations within the following classes:
+  * Permutation
+  * PermutationIterator
+  * KendallTauDistance
+  * WeightedKendallTauDistance.
+  * CyclicEdgeDistance
+  * CyclicRTypeDistance.
+  * The various SequenceSamplers
+  * KendallTauSequenceDistance
 
 ### Deprecated