update config examples

example/config/cashierd.toml

@@ -1,6 +1,10 @@
 accept_url = "127.0.0.1:7777"
 rpc_url = "127.0.0.1:8000"
 gateway_url = "127.0.0.1:3333"
+gateway_subscriber_url = "127.0.0.1:4444"
 log_path = "/tmp/cashierd.log"
 password = "TEST_PASSWORD"
 client_password = "TEST_PASSWORD"
+
+
+