Modify access rules

project.config

diff --git a/project.config b/project.config
index 6616f1e..fb8e811 100644
--- a/project.config
+++ b/project.config
@@ -32,6 +32,7 @@
 	editTopicName = +force group Project Owners
 	editTopicName = +force group mdb/upspin-admin
 	push = +force group nobody
+	delete = group mdb/upspin-admin
 [access "refs/meta/config"]
 	exclusiveGroupPermissions = read
 	read = group Project Owners