Add Oleksandr Motsok to list of authors

I have forgotten to add myself as an author in CL with code
changes, so I adding it in separate CL

Change-Id: Ieeb59be3f5631030fea01adffcf733ef1fac573e
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8620
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>

AUTHORS

diff --git a/AUTHORS b/AUTHORS
index 0640d6c..6241ed0 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -45,3 +45,4 @@
 Tripta Gupta <tripta.g@samsung.com>
 Wink Saville <wink@saville.com>
 Yuriy Taraday <yorik.sar@gmail.com>
+Oleksandr Motsok <boramaabak@gmail.com>