Update security policy version list

SECURITY.md

@@ -6,7 +6,8 @@ Following versions of the project are currently being supported with security up
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 0.6.x   | :white_check_mark: |
+| 0.7.x   | :white_check_mark: |
+| 0.6.x   | :x:                |
 | 0.5.x   | :x:                |
 | 0.4.x   | :x:                |
 | 0.3.x   | :x:                |