Update CHANGELOG.md

Signed-off-by: Jinyao Chen <cjy513203427@gmail.com>

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Add `Datumaro` annotation format support by @ashwinvaidya17 in https://github.com/openvinotoolkit/anomalib/pull/2377
 - Add `AUPIMO` tutorials notebooks in https://github.com/openvinotoolkit/anomalib/pull/2330 and https://github.com/openvinotoolkit/anomalib/pull/2336
 - Add `AUPIMO` metric by [jpcbertoldo](https://github.com/jpcbertoldo) in https://github.com/openvinotoolkit/anomalib/pull/1726 and refactored by [ashwinvaidya17](https://github.com/ashwinvaidya17) in https://github.com/openvinotoolkit/anomalib/pull/2329
+- Add part of implementation of `RD++` model with regard to https://github.com/openvinotoolkit/anomalib/discussions/1605.
 
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