Update changelog

diff --git a/CHANGELOG.md b/CHANGELOG.md
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@@ -1,4 +1,6 @@
-# Changelog
+Changelog
+=========
+
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog][] and this project adheres to
@@ -7,14 +9,26 @@ The format is based on [Keep a Changelog][] and this project adheres to
 [Keep a Changelog]: http://keepachangelog.com/
 [Semantic Versioning]: http://semver.org/
 
-## Unreleased
-### Added
+
+Unreleased
+==========
+
+
+0.4.0 - 2021-04-08
+==================
+
+Added
+-----
+
 - Getting multiple values from scenario results. Plot them.
 
-### Changed
+Changed
+-------
+
 - Split scenarios to *trivial* and *non-trivial* directories.
 - Clean the plot json script code.
 
+
 ## 0.3.0 - 2020-05-26
 ### Added
 - Python plot procedures: