Modify access rules

project.config

diff --git a/project.config b/project.config
index 0a286f1..964efcc 100644
--- a/project.config
+++ b/project.config
@@ -58,6 +58,7 @@
 	value = +2 Looks good to me, approved
 [access "refs/for/*"]
 	addPatchSet = group Registered Users
+	pushMerge = block group Registered Users
 [reviewer]
 	enableByEmail = true
 [capability]