Add in mduffy github

go/go/templates/core/about.html

@@ -90,7 +90,7 @@ SRCT Go • About
       <a href="https://github.com/nanderson94">Nicholas Anderson</a>,
       <a href="https://github.com/zmknox">Zach Knox</a>,
       <a href="https://github.com/mike-bailey">Michael Bailey</a>,
-      <a href="">Mattias Duffy</a>,
+      <a href="https://github.com/mdsecurity">Mattias Duffy</a>,
       <a href="https://github.com/IAmEyad">Eyad Hasan</a>,
       and <a href="https://github.com/danielkim1">Danny Kim</a>.
       <br></br>