Add release date

Author: PicoJr

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [2.1.0](https://crates.io/crates/rtw/2.1.0) Not Released
+## [2.1.0](https://crates.io/crates/rtw/2.1.0) Dec 8, 2020
 
 * Add `--report` option to summary command.