Modify access rules
diff --git a/project.config b/project.config
index 22360a4..552a8e4 100644
--- a/project.config
+++ b/project.config
@@ -58,3 +58,5 @@
 [notify "codereviews"]
 	email = golang-codereviews@googlegroups.com
 	header = cc
+[access "refs/for/refs/heads/master"]
+	submit = group approvers