Fix version number in changelog.

Author: mikebronner

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).
 
-## [0.7.3] - 2019-12-22
+## [0.7.4] - 2019-12-22
 ### Added
 - documentation to explain that database transactions are currently not supported.
 - compatibility with binary UUIDs. Thanks @padre!