added v6 as new major

Author: Burnett01

SECURITY.md

@@ -6,9 +6,9 @@ The following versions are currently being supported with security updates:
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 6.x   | :white_check_mark: |
 | 5.x   | :white_check_mark: |
-| 4.1   | :white_check_mark: |
-| 4.0   | :white_check_mark: |
+| 4.x   | :white_check_mark: |
 | 3.0   | :x: |
 | 2.0   | :x:                |
 | 1.0   | :x:                |