Stack toast messages

[kerkness]

Just a little feature request. Sometimes in my app the user will get two or three notificiations in fairely quick succession about 1 or 2 seconds apart.

It would be handy if the Toast component allowed for more than one message at a time so if a second message is necessary before the first message timesout they stack on top of each other.

I use Notistack in a React app and it works very well for this usecase.
https://notistack.com/features/basic

The library provides a "maximum snackbars" property that lets your push notification messages onto the "stack". A similar feature in flux:toast might be something to consider.

[jeffchown]

Hi @kerkness. See #137

[kerkness]

Thanks. I had searched in issues but not discussions