Add nigi@chromium.org to OWNERS.

Change-Id: I5b653bc3a0fed0ad59d78868e5c8da20132c7813
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/101550
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
diff --git a/OWNERS b/OWNERS
index 5eb9424..c1a96c3 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,5 @@
 jam@chromium.org
+nigi@chromium.org
 npm@chromium.org
 thestig@chromium.org
 tsepez@chromium.org