chore: Update changelog date

Author: Snazzah

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
 ## [Unreleased]
-## [1.0.0] - 2021-04-06
+## [1.0.0] - 2021-06-01
 - Initial release.
 
 [Unreleased]: https://github.com/Dexare/cron/compare/v1.0.0...HEAD