docs: fix changelog

Author: alexander-akait

CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [4.0.0-rc.4](https://github.com/postcss-modules-local-by-default/compare/v4.0.0-rc.4...v4.0.0) - 2020-10-13
+## [4.0.0](https://github.com/postcss-modules-local-by-default/compare/v4.0.0-rc.4...v4.0.0) - 2020-10-13
 
 ### Fixes