Prepare release 2.2.0

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).
 
-## [2.2.0](https://crates.io/crates/rtw/2.2.0) Unreleased
+## [2.2.0](https://crates.io/crates/rtw/2.2.0) Mar 20, 2021
 
 * Add `<id>` optional parameter to `continue`.
 * Add tip for using `--overlap` when activities are overlapping.