Expose LastOutput to enable scrolling output (#135)
Expose LastOutput to enable scrolling output (#135)

This allows printing output above the spinner. In our use-case,
we have logs streaming above the spinner using:

`fmt.Fprintf(wtr, "\r%s\n")`

By exposing LastOutput, we can immediately print the spinner again.
Without this field, flashing occurs due to the spinner delay.
briandowns/spinner