chore: modify SECURITY.md file

Author: perisicnikola37

SECURITY.md

@@ -7,10 +7,9 @@ currently being supported with security updates.
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 5.1.x   | :white_check_mark: |
-| 5.0.x   | :x:                |
-| 4.0.x   | :white_check_mark: |
-| < 4.0   | :x:                |
+| 3.x     | :white_check_mark: |
+| 2.x     | :white_check_mark: |
+| 1.x     | :x:                |
 
 ## Reporting a Vulnerability