onSelect typescript issue

[wgorman-sugarcrm]

index.d.ts defines props onSelect as:
https://github.com/react-component/calendar/blob/9.x/index.d.ts#L25

but the mixin allows for a second parameter:
https://github.com/react-component/calendar/blob/9.x/src/mixin/CalendarMixin.js#L94

I believe something like this would resolve the issue:
onSelect?: (date: Moment, cause?: {source: string}) => void;

Thanks!