Update supported versions in security policy

SECURITY.md

@@ -6,8 +6,9 @@ Following versions of the project are currently being supported with security up
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 0.3.x   | :white_check_mark: |
-| 0.2.x   | :x: |
+| 0.4.x   | :white_check_mark: |
+| 0.3.x   | :x:                |
+| 0.2.x   | :x:                |
 | 0.1.x   | :x:                |
 
 ## Reporting a Vulnerability