Update CHANGELOG.md

Author: cicirello

CHANGELOG.md

@@ -6,8 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - 2022-11-18
 
+**BREAKING CHANGES:** See the Removed section for details.
+
 ### Added
 * Added the SequenceSampler interface's methods to SequenceReservoirSampler.
+* Added the SequenceSampler interface's methods to SequencePoolSampler.
 
 ### Changed
 * SequenceSampler converted from a utility class of static methods to an interface, retaining the existing static
@@ -17,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 * SequenceSampler.sampleReservoir methods, previously deprecated in 4.3.0, replaced by the SequenceReservoirSampler class.
+* SequenceSampler.samplePool methods, previously deprecated in 4.3.0, replaced by the SequencePoolSampler class.
 
 ### Fixed