Tree is missing `multiselect` prop

[kamilkazmierczakMtab]

Is your feature request related to a problem? Please describe. There are scenarios when someone might want to allow user to select only single item - like tree navigation

Describe the solution you'd like Provide multiselect prop that is true by default

Describe alternatives you've considered It's almost impossible to easily achieve it now. From what I found using ControlledTreeEnvironment could do the trick but that should not be necessary

[lukasbach]

I released a new version, in which a disableMultiselect prop is available on the uncontrolled tree environment. I didn't add it to the controlled environment, since there you have a pretty good control over how selections work anyway. Let me know if that works for you.

[kamilkazmierczakMtab]

It works well thank you.