Update changelog

Author: titouanmathis

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## v2.0.0-alpha.1 - 2024.04.16
+
 ### Added
 
 - Add support for both `-c` or `-l` flag from the Prettier command ([741f555](https://github.com/studiometa/prettier-formatter-gitlab/commit/741f555))