Update CHANGELOG

Author: sdispater

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Change Log
 
-## [Unreleased]
+## [0.4.0] - 2018-03-08
 
 ### Added
 
@@ -64,7 +64,8 @@ Initial release
 
 
 
-[Unreleased]: https://github.com/sdispater/poetry/compare/0.3.0...master
+[Unreleased]: https://github.com/sdispater/poetry/compare/0.4.0...master
+[0.4.0]: https://github.com/sdispater/poetry/releases/tag/0.4.0
 [0.3.0]: https://github.com/sdispater/poetry/releases/tag/0.3.0
 [0.2.0]: https://github.com/sdispater/poetry/releases/tag/0.2.0
 [0.1.0]: https://github.com/sdispater/poetry/releases/tag/0.1.0