Fixed usage statement with correct executable name
Fixed usage statement with correct executable name

wallyqs/go-nats,apcera/nats,pires/nats,pires/nats,nats-io/go-nats,nats-io/nats,apcera/nats,wallyqs/go-nats,ZebinKang/go-nats,nats-io/go-nats,nats-io/nats,ZebinKang/go-nats