Update supported versions

Author: TrafeX

SECURITY.md

@@ -5,7 +5,8 @@ Only the latest version will be supported and receive security updates.
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 2.x.x   | :white_check_mark: |
+| 3.x.x   | :white_check_mark: |
+| 2.x.x   | :x:                |
 | 1.x.x   | :x:                |
 
 ## Reporting a Vulnerability