Add WPVDB references

Author: rastating

modules/exploits/dwnldr_xss_shell_upload.rb

@@ -10,6 +10,7 @@ def initialize
         'Rob Carr <rob[at]rastating.com>' # Disclosure + WPXF module
       ],
       references: [
+        ['WPVDB', '8556'],
         ['URL', 'http://blog.rastating.com/dwnldr-1-0-stored-xss-disclosure']
       ],
       date: 'Jul 18 2016'

modules/exploits/woo_email_control_reflected_xss_shell_upload.rb

@@ -10,6 +10,7 @@ def initialize
         'Rob Carr <rob[at]rastating.com>' # Disclosure + WPXF module
       ],
       references: [
+        ['WPVDB', '8559'],
         ['URL', 'http://blog.rastating.com/woo-email-control-1-01-reflected-xss-disclosure']
       ],
       date: 'Jul 18 2016'