Update to v6.1.1, set release date, include PR link

Author: Doug Toppin

CHANGELOG.md

@@ -5,14 +5,14 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [6.1.1] - 2023-02-02
+## [6.1.1] - 2023-02-09
 
 ### Added
 
 - package-lock.json for all modules [#426](https://github.com/aws-solutions/serverless-image-handler/pull/426)
 - github workflows for running unit test, eslint and prettier formatting, cdk nag, security scans [#402](https://github.com/aws-solutions/serverless-image-handler/pull/402)
 - demo-ui unicode support [#416](https://github.com/aws-solutions/serverless-image-handler/issues/416)
-- support for multiple cloudformation stack deployments in the same region
+- support for multiple cloudformation stack deployments in the same region [#438](https://github.com/aws-solutions/serverless-image-handler/pull/438)
 
 ### Changed