chore: prepare 5.0.4 release

Author: evilebottnawi

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org).
 
+## 5.0.4 - 2018-01-16
+
+* Fix: typo in source code message errors.
+
 ## 5.0.3 - 2018-01-16
 
 * Chore: minimum required `cosmiconfig` version is now `^4.0.0`.