Update CHANGELOG.md

Author: abstractOwl

CHANGELOG.md

@@ -6,6 +6,9 @@ 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
+- `opentelemetry-sdk-extension-aws` Register AWS resource detectors under the
+  `opentelemetry_resource_detector` entry point
+  ([#2382](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2382))
 
 ## Version 1.24.0/0.45b0 (2024-03-28)