Add changelog

Author: xrmx

CHANGELOG.md

@@ -43,6 +43,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4108](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4108))
 - `opentelemetry-instrumentation-tornado`: Implement new semantic convention opt-in migration
   ([#3993](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3993))
+- `opentelemetry-instrumentation-tornado`: pass request attributes at span creation
+  ([#4140](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4140))
 - `opentelemetry-instrumentation-pyramid` Implement new semantic convention opt-in migration
   ([#3982](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3982))