Add Masahiko Sawada to security team

Author: Joe Conway <mail@joeconway.com>
Discussion: https://postgr.es/m/3faceb4c-99f1-43eb-9f59-e24aec559b3c@joeconway.com

Author: danielgustafsson

templates/security/security.html

@@ -338,6 +338,7 @@ <h2>The PostgreSQL Security Team</h2>
   <li>Joe Conway</li>
   <li>Jonathan Katz</li>
   <li>Magnus Hagander</li>
+  <li>Masahiko Sawada</li>
   <li>Michael Paquier</li>
   <li>Nathan Bossart</li>
   <li>Noah Misch</li>