Remove placeholder text

Author: l0gicgate

SECURITY.md

@@ -1,15 +1,14 @@
 # Security Policy
 
-## Supported Versions
+### Supported Versions
 
-Use this section to tell people about which versions of your project are
-currently being supported with security updates.
 
 | Version | Supported          |
 | ------- | ------------------ |
 | 3.x.x   | :white_check_mark: |
 | 4.x.x   | :white_check_mark: |
 
-## Reporting a Vulnerability
+
+### Reporting a Vulnerability
 
 To report a vulnerability please send an email to security@slimframework.com