Move changelog entry to the proper place

Author: fcollonval

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- sdk: Add exemplars to the Prometheus exporter
+  ([#4178](https://github.com/open-telemetry/opentelemetry-python/pull/4178))
+
 ## Version 1.28.0/0.49b0 (2024-11-05)
 
 - Removed superfluous py.typed markers and added them where they were missing
@@ -19,8 +22,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4182](https://github.com/open-telemetry/opentelemetry-python/pull/4182))
 - sdk: Implementation of exemplars
   ([#4094](https://github.com/open-telemetry/opentelemetry-python/pull/4094))
-- sdk: Add exemplars to the Prometheus exporter
-  ([#4178](https://github.com/open-telemetry/opentelemetry-python/pull/4178))
 - Implement events sdk
   ([#4176](https://github.com/open-telemetry/opentelemetry-python/pull/4176))
 - Update semantic conventions to version 1.28.0