Type definitions are wrong for the selectTemplate option

[Christophe Coevoet]

The type definition declares the selectTemplate option as a callable with the signature (item: TributeItem<T>) => string.
However, based on errors I got in my logs, it seems like the argument can also be undefined sometimes. And the defaultSelectTemplate indeed handles the case of undefined.

Either the types should be updated to reflect that or the case of undefined should be handled by the caller directly.

[Christophe Coevoet]

Also, as the callback is called with the Tribute object as context, this should also be reflected in the type IMO.

[Jordan Humphreys]

Can you submit a PR to fix this?

[Christophe Coevoet]

@mrsweaters sure. Here it is.