>>> require "name_of_gem_here"
true
>>> NameOfGemHere.say_goodbye()
Goodbye, World!
>>> NameOfGemHere.say_goodbye_in("es")
Adios, Mundo!
>>> NameOfGemHere.say_goodbye_to("Andrew")
Goodbye, Andrew!
>>> NameOfGemHere.say_goodbye_to("Andrew", in: "es")
Adios, Andrew!