Added authlogic_x509 plugin to the "Add ons" list

README.rdoc

@@ -74,6 +74,7 @@ If you find a bug or a problem please post it in the issues section. If you need
 * <b>Authlogic OAuth (Twitter):</b> http://github.com/jrallison/authlogic_oauth
 * <b>Authlogic Oauth and OpenID:</b> http://github.com/viatropos/authlogic-connect
 * <b>Authlogic PAM:</b> http://github.com/nbudin/authlogic_pam
+* <b>Authlogic x509:</b> http://github.com/auth-scc/authlogic_x509
 
 If you create one of your own, please let me know about it so I can add it to this list. Or just fork the project, add your link, and send me a pull request.