A+C: add Xia Bin (individual CLA)

This CLA replaces the one for 'snyh'.
Verified by hand.

LGTM=minux
R=iant, minux
CC=golang-codereviews
https://golang.org/cl/112420043

AUTHORS

@@ -380,7 +380,6 @@ Shawn Smith <shawn.p.smith@gmail.com>
 Shenghou Ma <minux.ma@gmail.com>
 Shivakumar GN <shivakumar.gn@gmail.com>
 Simon Whitehead <chemnova@gmail.com>
-snyh <snyh@snyh.org>
 Sokolov Yura <funny.falcon@gmail.com>
 Spring Mc <heresy.mc@gmail.com>
 StalkR <stalkr@stalkr.net>
@@ -421,6 +420,7 @@ Wei Guangjing <vcc.163@gmail.com>
 Willem van der Schyff <willemvds@gmail.com>
 William Josephson <wjosephson@gmail.com>
 William Orr <will@worrbase.com> <ay1244@gmail.com>
+Xia Bin <snyh@snyh.org>
 Xing Xing <mikespook@gmail.com>
 Yasuhiro Matsumoto <mattn.jp@gmail.com>
 Yissakhar Z. Beck <yissakhar.beck@gmail.com>

CONTRIBUTORS

@@ -526,7 +526,6 @@ Shawn Smith <shawn.p.smith@gmail.com>
 Shenghou Ma <minux@golang.org> <minux.ma@gmail.com>
 Shivakumar GN <shivakumar.gn@gmail.com>
 Simon Whitehead <chemnova@gmail.com>
-snyh <snyh@snyh.org>
 Sokolov Yura <funny.falcon@gmail.com>
 Spring Mc <heresy.mc@gmail.com>
 StalkR <stalkr@stalkr.net>
@@ -577,6 +576,7 @@ Willem van der Schyff <willemvds@gmail.com>
 William Chan <willchan@chromium.org>
 William Josephson <wjosephson@gmail.com>
 William Orr <will@worrbase.com> <ay1244@gmail.com>
+Xia Bin <snyh@snyh.org>
 Xing Xing <mikespook@gmail.com>
 Yan Zou <yzou@google.com>
 Yasuhiro Matsumoto <mattn.jp@gmail.com>