docs: updated version number

FossilOrigin-Name: 43694d90e75531f75df391bdf98692b0c5640f461fb4f49ae454a11bf4f2fe41

Author: thindil

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 Tag **BREAKING** means the change break compatibility with a previous version
 of the shell.
 
-## [Unreleased]
+## [0.4.0] - 2022-10-14
 
 ### Added
 - **BREAKING**: Version to the plugins API

nish.nimble

@@ -2,7 +2,7 @@ import os
 
 # Package
 
-version = "0.3.0"
+version = "0.4.0"
 author = "Bartek thindil Jasicki"
 description = "An experimental command line shell"
 license = "BSD-3-Clause"