CONTRIBUTORS: add Michael Matloob

Change-Id: I11531432aaee8bab09f6b964b398f3faf0970a85
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/291589
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index e151d46..aaeb852 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -57,6 +57,7 @@
 Matthias Klose <doko@ubuntu.com>
 Matthieu Sarter <matthieu.sarter.external@atos.net>
 Michael Hudson-Doyle <michael.hudson@linaro.org>
+Michael Matloob <matloob@google.com>
 Nikhil Benesch <nikhil.benesch@gmail.com>
 Paul Murphy <murp@ibm.com>
 Peter Collingbourne <pcc@google.com>