Review access change

Change-Id: Ia9618bdce22b5d0b3cf39743ae67d43e222f118d
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/218604
Reviewed-by: Filippo Valsorda <filippo@golang.org>

project.config

diff --git a/project.config b/project.config
index d6cb0f5..9abbe59 100644
--- a/project.config
+++ b/project.config
@@ -87,6 +87,7 @@
 [access "^refs/heads/release-branch.+"]
 	exclusiveGroupPermissions = submit
 	submit = group osp-team
+	submit = group release-managers
 [accounts]
 	sameGroupVisibility = deny group contributed-in-past
 	sameGroupVisibility = deny group google/google-union:signcla