Throw error for Option to option() or requiredOption()

[shadowspawn]

Pull Request

Small possible improvement from personal experience. (Fairly specific, might be too special case?)

Problem

I have made the mistake a couple of times of switching to an Option to use extra features, but forgetting to change to .addOption(). It also looks like something which might work.

e.g. start with

program
    .option('-s, --secret`, 'secret option for developers')

change to

program
    .option(new Option('-s, --secret', 'secret option for developers').hideHelp());

and get error

    this.required = flags.includes('<'); // A value must be supplied when the option is specified.
                          ^

TypeError: flags.includes is not a function

Solution

Throw a specific error to help programmer work out the mistake quickly.

      throw new Error('To add an Option object use addOption() instead of option() or requiredOption()');
      ^

Error: To add an Option object use addOption() instead of option() or requiredOption()

[abetomo]

LGTM!