add date for 0.9.0 to CHANGELOG

Author: orbeckst

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).
 
-## [0.9.0] - ????-??-??
+## [0.9.0] - 2023-10-30
 
 ### Changes
 - Update package to only support NEP29 range (Python 3.9 - 3.12 as of writing)