docs: Add release notice to readme.md and update CHANGELOG.md

Author: connorgmeean

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [Unreleased]
+## [4.0.0]
 
 - `doom_modules.lua` renamed to `modules.lua`
 - `doom_config.lua` renamed to `config.lua`

README.md

@@ -18,6 +18,11 @@
 
 </div>
 
+> Note: Doom nvim v4.0.0 has just been released (29th July 2022).
+> This release introduces many changes so feel free to ask questions on the
+> discord or in the github discussions page or create an issue ticket and I'll
+> solve it as soon as possible.
+
 ## What is Doom Nvim?
 
 Doom Nvim is a Neovim interpretation of the [doom-emacs](https://github.com/hlissner/doom-emacs) framework, adapted to Vim philosophy.