Add URL reference

Author: rastating

modules/exploits/unix/webapp/wp_holding_pattern_file_upload.rb

@@ -32,7 +32,8 @@ def initialize(info = {})
       'References'      =>
         [
           ['CVE', '2015-1172'],
-          ['WPVDB', '7784']
+          ['WPVDB', '7784'],
+          ['URL', 'http://packetstormsecurity.com/files/130282/WordPress-Holding-Pattern-0.6-Shell-Upload.html']
         ],
       'DisclosureDate'  => 'Feb 11 2015',
       'Platform'        => 'php',