Review access change

Change-Id: I5e7291d64bf5838098e78ae3662d7ba81198c9a2
Reviewed-on: https://flutter-review.googlesource.com/c/Public-Projects/+/49740
Reviewed-by: Ricardo Amador <ricardoamador@google.com>

project.config

diff --git a/project.config b/project.config
index a672eb9..662ae18 100644
--- a/project.config
+++ b/project.config
@@ -5,3 +5,5 @@
 [access "refs/*"]
 	read = group Anonymous Users
 	read = group Registered Users
+[access "refs/for/refs/heads/*"]
+	push = group Registered Users