Update CHANGELOG.md

Author: devinroth

CHANGELOG.md

@@ -14,7 +14,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Keep track of which apps are connected to the driver.
 
 
-## [0.3.0] - Unreleased
+## [0.3.0] - 2021-12-07
 
 ### Added
 - Sample rates: 352800, 384000, 705600, 768000, 8000, 16000