Update SECURITY.md with correct version info.

SECURITY.md

@@ -5,15 +5,16 @@
 Smarty currently supports the latest minor version of Smarty 3 and Smarty 4.
 
 | Version | Supported          |
-| ------- | ------------------ |
-| 4.0.x   | :white_check_mark: |
+|---------|--------------------|
+| 4.3.x   | :white_check_mark: |
 | 3.1.x   | :white_check_mark: |
 | < 3.1   | :x:                |
 
 ## Reporting a Vulnerability
 
- If you have discovered a security issue with Smarty, please contact us at mail [at] simonwisselink.nl. Do not 
- disclose your findings publicly and PLEASE PLEASE do not file an Issue.
+If you have discovered a security issue with Smarty, please contact us at mail [at] simonwisselink.nl. Do not 
+disclose your findings publicly and **PLEASE** do not file an Issue (because that would disclose your findings 
+publicly.)
 
 We will try to confirm the vulnerability and develop a fix if appropriate. When we release the fix, we will publish 
 a security release. Please let us know if you want to be credited.