v0.8-alpha

• Add smart publish #52
• Add Direct connection, it is possible to use direct connection like:

    direct, err := stream.NewDirectClient(&stream.Broker{
    	Host:     "localhost",
    	Port:     "5552",
    	User:     "guest",
    	Vhost:    "/",
    	Password: "guest",
    	Scheme:   "rabbitmq-stream",
    })