release v0.4.0

CHANGELOG.md

@@ -1,8 +1,9 @@
 # Changelog
 
-## v0.4.0 (unreleased)
+## v0.4.0 (23.02.2024)
 
-### Deprecations
+Version 0.4.0 simplifies the way figures with a `mpu.colorbar` have to be saved  and
+bumps the supported versions.
 
 ### Breaking changes
 
@@ -27,11 +28,6 @@
   automatically ([#98](https://github.com/mathause/mplotutils/pull/98)).
 - Add python 3.12 to list of supported versions ([#89](https://github.com/mathause/mplotutils/pull/89)).
 
-### Bug fixes
-
-### Internal changes
-
-
 ## v0.3.1 (09.02.2023)
 
 Version v0.3.1 fixes a regression and an additional bug from v0.3.0. It's recommended to use this version.