add changelog

Author: TheAnshul756

CHANGELOG.md

@@ -48,6 +48,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1879](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1879))
 - Add optional distro and configurator selection for auto-instrumentation
   ([#1823](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1823))
+- Add option to add Opentelemetry middleware at specific position in middleware chain
+  ([#1903]https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1903)
 
 ## Version 1.18.0/0.39b0 (2023-05-10)