Cell edit dropdown selected value index

@AllenFang I am working on cell edit functionality of react-bootstrap-table. In which I am using `editable={ { type: 'select', options: { values} } }` to make the cell editable with drop-down values. After selecting a value from this drop-down, I want its unique index value as drop-down options have common values. Is there any way to do it?

Thanks for your awesome work !