A+C: add Petar Maymounkov (individual CLA)

R=iant
CC=golang-dev, petar-m
https://golang.org/cl/189095
diff --git a/AUTHORS b/AUTHORS
index 6a2efe1..4bfb942 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -41,6 +41,7 @@
 Michael Hoisie <hoisie@gmail.com>
 Moriyoshi Koizumi <mozo@mozo.jp>
 Môshe van der Sterre <moshevds@gmail.com>
+Petar Maymounkov <petarm@gmail.com>
 Peter Froehlich <peter.hans.froehlich@gmail.com>
 Roger Peppe <rogpeppe@gmail.com>
 Ross Light <rlight2@gmail.com>