Update SECURITY.md

Durr

Author: JohnONolan

SECURITY.md

@@ -1,6 +1,6 @@
 # Reporting Security Issues
 
-If you discover a security issue in Ghost, please report it by sending an email to security[at]ghost[dot]org
+If you discover a security issue in Ghost, please report it by sending an email to security@ghost.org
 
 This will allow us to assess the risk, and make a fix available before we add a bug report to the GitHub repository.