A+C: add Benny Siegert, individual CLA

Change-Id: I61f1dca3eaa4688fc3c5d469715785b002f1e9e8
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/229083
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/AUTHORS b/AUTHORS
index 1e5fcfc..b9b3961 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -14,6 +14,7 @@
 Atos Infogerance
 Baokun Lee <nototon@gmail.com>
 Ben Shi <powerman1st@163.com>
+Benny Siegert <bsiegert@gmail.com>
 Cavium
 Christopher Wedgwood <cw@f00f.org>
 Dave Cheney <dave@cheney.net>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index bbbb293..c0f3d4d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -32,6 +32,7 @@
 Andrew Wilkins <axwalk@gmail.com>
 Baokun Lee <nototon@gmail.com>
 Ben Shi <powerman1st@163.com>
+Benny Siegert <bsiegert@gmail.com>
 Cherry Zhang <cherryyz@google.com>
 Chris Manghane <cmang@golang.org>
 Christopher Wedgwood <cw@f00f.org>