Added changelog, updated readme

CHANGELOG-4.0.md

@@ -0,0 +1,11 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [4.0.0] - 2022-10-19
+### Added
+- Codeception v5 support.
+### Removed
+- Drop Codeception v4 support. If you use Codeception v4, please use the previous version from library.

README.md

@@ -13,7 +13,7 @@ Inspiration comes from [herloct/codeception-slim-module](https://github.com/herl
 ### Minimal requirements
 - php: `^8.0`
 - slim/slim: `^4.7`
-- codeception/codeception: `^4.0`
+- codeception/codeception: `^5.0`
 
 If you don't know Codeception, please check [Quickstart Guide](https://codeception.com/quickstart) first.