Update SECURITY.md

Author: pradosh-arduino

SECURITY.md

@@ -6,11 +6,12 @@ here are the version that is currently supported
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 2.7.x   | :white_check_mark: |
 | 2.6.x-x | :white_check_mark: |
 | 2.5.x   | :white_check_mark: |
 | 2.4.x   | :white_check_mark: |
 | 2.3.x   | :white_check_mark: |
-| 2.2.x   | :white_check_mark: |
+| 2.2.x   | :x:                |
 | < 2.1.0 | :x:                |
 
 ## Reporting a Vulnerability