Prepare changelog for 3.5

Author: Jean85

CHANGELOG.md

@@ -5,9 +5,12 @@ 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).
 
 ## Unreleased
- - Capture and flush messages in a Messenger Worker context (#326, thanks to @emarref)
  - ...
 
+## 3.5.0 (2020-04-28)
+ - Capture and flush messages in a Messenger Worker context (#326, thanks to @emarref)
+ - Revert wrong change on `composer.json`
+
 ## 3.4.4 (2020-03-16)
  - Improve `release` option default value (#325)