Add changelog

Author: xrmx

CHANGELOG.md

@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add `rstcheck` to pre-commit to stop introducing invalid RST
   ([#4755](https://github.com/open-telemetry/opentelemetry-python/pull/4755))
+- logs: extend Logger.emit to accept separated keyword arguments
+  ([#4737](https://github.com/open-telemetry/opentelemetry-python/pull/4737))
 
 ## Version 1.37.0/0.58b0 (2025-09-11)