react-json-tree: customize JSONArrow

[QuentinBrosse]

Hi !

According to alexkuz/react-json-tree#100, it is not possible to customize the JSONArrow component.

I need to change this arrow by a +/- or another icon. Does PR are welcome or you don't want to offer this option ?

Thanks a lot ! :)

[dchristian-ias]

Would love this option as well. Being able to simply replace the JSONArrow with my own customArrow component would be ideal. Thanks for a great tool!