README clarification regarding authentication

[Overdrivr]

It is not obvious from the README that credentials must be provided per-queue. An example would be helpful, something like

const arena = Arena({
	queues: [
		{
		  "name": "****",
		  "hostId": "*******",
		  "host": "*******",
		  "port": xxxxx,
		  "password": "**********************",
		},
		{
			// etc

[bradvogel]

Thanks. Prs welcome :)