update release date

Author: 902seanryan

CHANGELOG.md

@@ -4,7 +4,7 @@ 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).
 
-## [2.2.3] - unreleased
+## [2.2.3] - 2021-05-21
 ## Changed
 - updated `singlePlay` response to not return an object containing the boolean, but just the boolean itself.