Format AUTHORS file (tensorflow#14881)

Androbin · sb2nov · commit 2f56cb1e1764 · 2017-11-29T16:02:05.000-08:00
diff --git a/AUTHORS b/AUTHORS
@@ -7,4 +7,4 @@
 # The email address is not required for organizations.
 
 Google Inc.
-Yuan Tang terrytangyuan@gmail.com
+Yuan Tang <terrytangyuan@gmail.com>
