Update CHANGELOG.md

Author: gkjohnson

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](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [0.3.0] - 2021-04-26
+## [0.3.1] - 2021-04-26
 ### Fixed
 - Type definitions not exporting correctly.