Update CHANGELOG.md

Author: AdrianSosic

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   composition via `+` (sum) and `*` (product), as well as `constant * kernel`
   for creating a `ScaleKernel` with a fixed output scale
 - `CategoricalFidelityParameter` and `NumericalDiscreteFidelityParameter` classes
+- `parameters/selector.py` module enabling convenient parameter subselection
 
 ### Breaking Changes
 - `ContinuousLinearConstraint.to_botorch` now returns a collection of constraint tuples