security: Enable validator fetch cert directly from interest sender

Change-Id: I8fab50145a9a053c85c1b2c6be752ba71b0120ef
Refs: #2237
diff --git a/AUTHORS.md b/AUTHORS.md
index 48457ef..59e7e77 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -39,4 +39,4 @@
 * Marcin Juszkiewicz    <http://marcin.juszkiewicz.com.pl/>
 * Susmit Shannigrahi    <https://www.linkedin.com/in/susmit-shannigrahi-90433b8>
 * José Quevedo          <http://atnog.av.it.pt/members/jquevedo>
-* Zhiyi Zhang           <zhangzhiyi1919@cs.ucla.edu>
+* Zhiyi Zhang           <http://irl.cs.ucla.edu/~zhiyi/>