Move changelog entry to Unreleased section

Author: aabmass

CHANGELOG.md

@@ -9,6 +9,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 > The following components are released independently and maintain individual CHANGELOG files.
 > Use [this search for a list of all CHANGELOG.md files in this repo](https://github.com/search?q=repo%3Aopen-telemetry%2Fopentelemetry-python-contrib+path%3A**%2FCHANGELOG.md&type=code).
 
+## Unreleased
+
+### Added
+
+### Fixed
+
+- `opentelemetry-instrumentation-httpx`: instrument_client is a static method again
+  ([#3003](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3003))
+
+### Breaking changes
+
 ## Version 1.28.1/0.49b1 (2024-11-08)
 
 ### Added
@@ -18,9 +29,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- `opentelemetry-instrumentation-httpx`: instrument_client is a static method again
-  ([#3003](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3003))
-
 ### Breaking changes
 
 - `opentelemetry-instrumentation-sqlalchemy` teach instruments version