Update references

Author: wvu

modules/exploits/unix/fileformat/imagemagick_delegate.rb

@@ -36,8 +36,10 @@ def initialize(info = {})
       ],
       'References'      => [
         %w{CVE 2016-3714},
+        %w{CVE 2016-7976},
         %w{URL https://imagetragick.com/},
         %w{URL http://seclists.org/oss-sec/2016/q2/205},
+        %w{URL http://seclists.org/oss-sec/2016/q3/682},
         %w{URL https://github.com/ImageMagick/ImageMagick/commit/06c41ab},
         %w{URL https://github.com/ImageMagick/ImageMagick/commit/a347456},
         %w{URL http://permalink.gmane.org/gmane.comp.security.oss.general/19669}