Can we make newUpdateRequest() function public?

It'd be awesome to use this module to be able to update the indexes on each sheet, but the privateness of the function which creates updateRequest structs prevents this.

spreadsheet/update_request.go

Line 9 in 41eea14

func newUpdateRequest(spreadsheet *Spreadsheet) (r *updateRequest, err error) {

Since all other methods on updateRequest are public too, it makes little sense to keep its constructor private actually.

Can we make this happen please?