Add WPVDB ID

Author: rastating

modules/exploits/woo_custom_checkout_field_xss_shell_upload.rb

@@ -10,6 +10,7 @@ def initialize
         'Rob Carr <rob[at]rastating.com>' # Disclosure + WPXF module
       ],
       references: [
+        ['WPVDB', '8567'],
         ['URL', 'http://blog.rastating.com/woo-custom-checkout-field-1-3-2-csrf-stored-xss-disclosure']
       ],
       date: 'Jul 23 2016'