I want add Months from a date.  

For example this my date 08/04/2019(D-M-Y)  

I use the method addMonth() and I get: 08/05/2019(D-M-Y),  

Which means carbon added **exactly plus one to the value of M**.  

But in the calendar the date is 06/05/2019 (D-M-Y)...  

This is my code:

```
$date = new Carbon('2019-04-08');
$date->addMonth() 

```

I want date will be after month like in the calendar.