Add WPVDB reference

Author: wvu

modules/auxiliary/scanner/http/wordpress_content_injection.rb

@@ -20,10 +20,11 @@ def initialize(info = {})
         'wvu'           # Metasploit module
       ],
       'References'     => [
-        ['URL', 'https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html'],
-        ['URL', 'https://secure.php.net/manual/en/language.types.type-juggling.php'],
-        ['URL', 'https://developer.wordpress.org/rest-api/using-the-rest-api/discovery/'],
-        ['URL', 'https://developer.wordpress.org/rest-api/reference/posts/']
+        ['WPVDB', '8734'],
+        ['URL',   'https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html'],
+        ['URL',   'https://secure.php.net/manual/en/language.types.type-juggling.php'],
+        ['URL',   'https://developer.wordpress.org/rest-api/using-the-rest-api/discovery/'],
+        ['URL',   'https://developer.wordpress.org/rest-api/reference/posts/']
       ],
       'DisclosureDate' => 'Feb 1 2017',
       'License'        => MSF_LICENSE,