Fix date in the changelog for release

Author: genebean

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org).
 
-## [2.1.0](https://github.com/grafana/puppet-promtail/tree/2.1.0) (2021-08-30)
+## [2.1.0](https://github.com/grafana/puppet-promtail/tree/2.1.0) (2021-08-31)
 
 [Full Changelog](https://github.com/grafana/puppet-promtail/compare/2.0.0...2.1.0)