no support for Material UI v5

[christineschuller]

No support for MUI v5

Expected Behavior

The page should open without problems, because there is no imported withStyles from the wrong source.

Current Behavior

I get the error message from the screenshot above.

Steps to Reproduce

With every project which uses the new MUI v5.

Link:

1. https://next.material-ui.com/guides/migration-v4/#material-ui-core-styles

Context

I want to stack snackbars.

Your Environment

Tech	Version
Notistack	^1.0.10
React	^17.0.2
Browser
MUI	5 beta

[lucasvienna]

Check #421

[iamhosseindhv]

You can download npm i notistack@next to use a version compatible with MUI v5 beta. If you're using MUI v5-rc, you'll have to wait for #423 to merge first.