Update CHANGELOG.md

Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>

Author: 2 people

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 
 - `opentelemetry-instrumentation-aiohttp-server`: Use `canonical` attribute of the `Resource` as a span name.
+  ([#3896](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3896))
 
 ### Added