Update CHANGELOG.md ahead of new release [skip ci]

Author: benjamin-maynard

CHANGELOG.md

@@ -4,6 +4,10 @@ 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).
 
+## [v2.1.0] - 28-08-2019
+### Added the ability to add a timestamp to the backup file name
+- Ability to append timestamp to the database dump via the BACKUP_TIMESTAMP environment variable added. Thanks & credit: @kuzm1ch
+
 ## [v2.0.1] - 21-05-2019
 ### Renamed to kubernetes-mysql-backup
 - Renamed to kubernetes-s3-mysql-backup from aws-database-backup to better describe function