Update SECURITY.md (#17)

Author: The-User-Python

SECURITY.md

@@ -10,8 +10,9 @@ currently being supported with security updates.
 | 5.1.x   | :white_check_mark: |
 | 5.0.x   | :x:                |
 | 4.0.x   | :white_check_mark: |
-| < 4.0   | :x:                |
-| < 8.8.  | 🤍
+| 4.0   | :x:                |
+| 8.8.x | 🤍
+| 4.7.x | :white_check_mark:|  
 ## Reporting a Vulnerability
 
 Use this section to tell people how to report a vulnerability.