Add v2.0.0 release date to change log

Author: delphidabbler

csdb/CHANGELOG.md

@@ -8,7 +8,7 @@ From v2.0.0 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).
 
-## v2.0.0 of 2020/xx/xx
+## v2.0.0 of 2020/05/02
 
 Initial release of v2 of the collection.