Add 0.2.3 release date

Author: CBroz1

CHANGELOG.md

@@ -3,7 +3,7 @@
 Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and
  [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) convention.
 
-## [0.2.3] - Unreleased
+## [0.2.3] - 2023-02-14
 
 + Add - extras_require install options for nwb and development requirement sets
 + Add - mkdocs notebook rendering