updating changelog

Author: Ivan Dubrov

CHANGELOG.md

@@ -5,6 +5,14 @@ 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).
 
+## [0.3.1] - 2019-08-15
+
+### Changed
+
+- Adding support for nested included modules.
+
+[0.3.1]: https://github.com/commure/sourcegen/releases/tag/sourcegen-cli-v0.3.1
+
 ## [0.3.0] - 2019-08-14
 
 ### Changed