docs: update changelog and bump version

Author: lindyhopchris

CHANGELOG.md

@@ -3,7 +3,9 @@
 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/).
 
-## Unreleased (Next Major Version)
+## Unreleased
+
+### [2.0.0-rc.1] - 2024-05-07
 
 **Refer to the [Upgrade Guide.](./docs/guide/upgrade.md)**