A: add ByteDance Ltd. (Corporate CLA)

Change-Id: Ia670d96ce4926c88d5d955d31dd89837b236a806
Reviewed-on: https://go-review.googlesource.com/c/go/+/403994
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: mzh <mzh@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

AUTHORS

@@ -198,6 +198,7 @@ Baiju Muthukadan <baiju.m.mail@gmail.com>
 Baokun Lee <nototon@gmail.com> <bk@golangcn.org>
 Bartosz Grzybowski <melkorm@gmail.com>
 Bastian Ike <bastian.ike@gmail.com>
+Beijing Bytedance Technology Co., Ltd.
 Ben Burkert <ben@benburkert.com>
 Ben Haines <bhainesva@gmail.com>
 Ben Lubar <ben.lubar@gmail.com>