Add reference

Author: jvazquez-r7

modules/exploits/multi/vnc/vnc_keyboard_exec.rb

@@ -36,6 +36,10 @@ def initialize(info = {})
           [ 'VNC Windows / VBScript CMDStager', { 'Platform' => 'win' } ],
           [ 'VNC Linux / Unix', { 'Arch' => ARCH_CMD, 'Platform' => 'unix' } ]
         ],
+      'References'     =>
+        [
+          [ 'URL', 'http://www.jedi.be/blog/2010/08/29/sending-keystrokes-to-your-virtual-machines-using-X-vnc-rdp-or-native/']
+        ],
       'DisclosureDate'  => 'Jul 10 2015',
       'DefaultTarget'   => 0))