Add options.array

[ianwalter]

It would set the property to an array regardless if one flag is passed or multiple flags are passed.

getopts(["-t", "lunch"], { array: ["t"] }) //=> { t: ["lunch"] }

The current behavior is that t's value would be the string "lunch". This would help me eliminate some boilerplate code that checks if the value is a string or array.

[jorgebucaran]

@ianwalter Sounds good. 👍