update release date

Author: 902seanryan

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [2.3.1] unreleased
+## [2.3.1] 2022-03-10
 ### Fixed
 - replaced `return` with `continue` in set up plugin function