A+C: add Stephen Weinberg (individual CLA)

R=r
CC=golang-dev
https://golang.org/cl/194064

AUTHORS

diff --git a/AUTHORS b/AUTHORS
index 1e20fe8..704a09b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -49,6 +49,7 @@
 Ross Light <rlight2@gmail.com>
 Sergey 'SnakE'  Gromov <snake.scaly@gmail.com>
 Sergio Luis O. B. Correia <sergio@larces.uece.br>
+Stephen Weinberg <stephen@q5comm.com>
 Sven Almgren <sven@tras.se>
 Tor Andersson <tor.andersson@gmail.com>
 William Josephson <wjosephson@gmail.com>