Preparing 2.7.1 release (#351)

Co-authored-by: Mirza Sohail Hussain <mirza.sohailhussain@gmail.com>

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [2.7.1] - December 20, 2022
+
+- Add support for asynchronous `Save` using `rest` UPS by setting `async` boolean value inside `config.yaml` ([#350](https://github.com/optimizely/agent/pull/350)).
+
 ## [2.7.0] - April 6, 2022
 
 - Add `UserProfileService` support. Out of the box implementations include `in-memory`, `rest` and `redis`. In-memory service supports both `fifo` and `lifo` orders. For details refer to our documentation page:  [UserProfileService](https://github.com/optimizely/agent/tree/master/plugins/userprofileservice) ([#326](https://github.com/optimizely/agent/pull/326), [#331](https://github.com/optimizely/agent/pull/331)).