Add new reference

Author: mpizala

modules/exploits/linux/http/docker_daemon_tcp.rb

@@ -28,6 +28,7 @@ def initialize(info = {})
       'Author'           => 'Martin Pizala', # started with dcos_marathon module from Erik Daguerre
       'License'          => MSF_LICENSE,
       'References'       => [
+        ['URL', 'https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface'],
         ['URL', 'https://docs.docker.com/engine/reference/commandline/dockerd/#bind-docker-to-another-hostport-or-a-unix-socket']
       ],
       'DisclosureDate'   => 'Jul 25, 2017',