[Docs] Update changelog and bump version

Author: lindyhopchris

CHANGELOG.md

@@ -3,6 +3,10 @@
 All notable changes to this project will be documented in this file. This project adheres to
 [Semantic Versioning](http://semver.org/) and [this changelog format](http://keepachangelog.com/).
 
+## [1.0.0] - 2021-07-31
+
+Initial stable release, with no changes from `1.0.0-beta.1`.
+
 ## [1.0.0-beta.1] - 2021-03-30
 
 Initial release.