requires NATS server

nats-streaming-server/nats-streaming-server.spec

@@ -45,7 +45,7 @@ Source2:      nats-streaming-server.conf
 
 #   build information
 BuildPreReq:  OpenPKG, openpkg >= 20160101, go
-PreReq:       OpenPKG, openpkg >= 20160101
+PreReq:       OpenPKG, openpkg >= 20160101, nats-server
 
 %description
     NATS is an open source, lightweight, high-performance cloud native