Prepare for release

Author: brews

CHANGELOG.md

@@ -4,7 +4,7 @@ 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).
 
-## [Unreleased]
+## [0.2.1] - 2022-09-22
 ### Fixed
 - Fix issue [#45](https://github.com/ClimateImpactLab/dscim/issues/45) by allowing for `emission_scenario` to be `None`. ([PR #46](https://github.com/ClimateImpactLab/dscim/pull/46), [PR #47](https://github.com/ClimateImpactLab/dscim/pull/47), [@JMGilbert](https://github.com/JMGilbert))