added entry to changelog

Author: alessandrobologna

Diff for: CHANGELOG.md

@@ -35,6 +35,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2363](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2363))
 - `opentelemetry-instrumentation-boto3sqs` Instrument Session and resource
   ([#2161](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2161))
+- `opentelemetry-instrumentation-aws-lambda` Fix exception handling for events with requestContext
+  ([#2418](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2418))
 - Use sqlalchemy version in sqlalchemy commenter instead of opentelemetry library version
   ([#2404](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2404))