Update changelog

Author: GonzaloGuasch

CHANGELOG.md

@@ -6,15 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
-- `opentelemetry-instrumentation-flask` Add `http.route` to metric attributes
-  ([#2621](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2621))
 - `opentelemetry-instrumentation-aws-lambda` Bugfix: AWS Lambda event source key incorrect for SNS in instrumentation library. 
   ([#2612](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2612))
 - `opentelemetry-instrumentation-system-metrics` Permit to use psutil 6.0+.
   ([#2630](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2630))
 
 ### Added
-
+- `opentelemetry-instrumentation-flask` Add `http.route` to metric attributes
+  ([#2621](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2621))
 - `opentelemetry-instrumentation-pyramid` Record exceptions raised when serving a request
   ([#2622](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2622))
 - `opentelemetry-sdk-extension-aws` Add AwsXrayLambdaPropagator