Reuse removed GreedyEither test-case for Either.
Reuse removed GreedyEither test-case for Either.

docopt/docopt,jagguli/docopt,snowsnail/docopt,benthomasson/docopt,Zearin/docopt,wkentaro/docopt,kenwilcox/docopt,crcsmnky/docopt,devonjones/docopt