add ref to check-messaging-07

Signed-off-by: Patrick Münch <patrick.muench1111@gmail.com>

Author: atomic111

controls/check-messaging.rb

@@ -143,6 +143,7 @@
 control 'check-messaging-07' do
   title 'Check for tls cipher honor order'
   desc 'The rabbitmq server should force the tls cipher order'
+  ref 'Strong Ciphers for Apache, nginx and Lighttpd', url: 'https://cipherli.st/'
 
   describe rabbitmq_config.params('rabbit','ssl_options','honor_cipher_order') do
     it { should eq true }