bump date of release

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).
 
-## [0.2.3] - 2022/04/??
+## [0.2.3] - 2022/05/10
 ### Fixed
 - Doing a substructure search on molecules with explicit hydrogens should now highlight
   the correct atoms.
@@ -170,4 +170,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   based on the different parameters, instead of a fixed 600px height. Fixes: Issue #6
 
 ## [0.0.2] - 2021/03/23
-- First release
+- First release