update changelog v1.0.0-rc.1 release date

Author: Phil Varner

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).
 
-## [v1.0.0-rc.1] - TBD
+## [v1.0.0-rc.1] - 2022-03-17
 
 ### Added