A+C: add Dustin Long (Markover Inc. DBA Poptip corporate CLA).

LGTM=adg
R=adg
CC=dustmop, golang-codereviews
https://golang.org/cl/111000044
diff --git a/AUTHORS b/AUTHORS
index 3ca2116..061fb98 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -257,6 +257,7 @@
 Marco Hennings <marco.hennings@freiheit.com>
 Marko Juhani Silokunnas <marko.silokunnas@gmail.com>
 Marko Tiikkaja <marko@joh.to>
+Markover Inc. DBA Poptip
 Markus Duft <markus.duft@salomon.at>
 Markus Sonderegger <marraison@gmail.com>
 Markus Zimmermann <zimmski@gmail.com>