Include v2.0.0

Author: drbyte

.github/SECURITY.md

@@ -6,8 +6,9 @@ Officially only the latest two releases of Zen Cart are supported for bugs and s
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 2.0.0   | :white_check_mark: |
 | 1.5.8   | :white_check_mark: |
-| 1.5.7   | :white_check_mark: |
+| 1.5.7   | :x:                |
 | <= 1.5.6   | :x:                |
 
 ## Reporting a Vulnerability