Update CHANGELOG.md

Author: samdark

CHANGELOG.md

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 Yii Framework 2 Symfony mailer extension Change Log
 ================================================
 
+4.0.1 under development
+-----------------------
+
 4.0.0 Jan 29, 2024
 ------------------
-- Enh: Use DI container for creating factories (sammousa)
-
-4.0.0
-------
 
+- Enh: Use DI container for creating factories (sammousa)
 - Enh #45: Include logger proxy as a dependency (sammousa)
 - Enh #45: Drop support for end-of-life php versions 7.4 and 8.0 (sammousa)
-
-3.1.0 under development
------------------------
-
 - Enh #52: Forward events to the Yii event system (sammousa)
 - Enh #45: Added option to create transport from Dsn object (Swanty)
 - Enh #50: Forward transport logs to the Yii Logger (sammousa)