How cancel subscription ?

[rullyalves]

I would like to add subscribers and unsubscribe something like create a subscription and be able to unsubscribe the specific subscription without breaking the observable completely

	ch := make(chan rxgo.Item)
	obs := rxgo.FromChannel(ch, rxgo.WithPublishStrategy())
        obs.Connect()
        newObs := obs.Map(func(ctx context.Context, i interface{}) (interface{}, error) {
		return i.(int) * 2, nil
	})
	
	dispose := newObs.DoOnNext(func(i interface{}) {
		fmt.Println(i)
	})
	
	dispose()