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Add a method to register the help flag #109

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Add a method to register the help flag #109

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Commits on Dec 15, 2021

  1. Add helpflag() to Options 

    When we add a flag with `reqopt()`, the mandatory flag is always
required. This behavior doesn't work well when we want to add a `help`
flag, which should work without the required flag is not specified like
`my_command --help`.

So, let's add `helpflag()` method, which add an optional flag "help"
which will allow `parse()` to skip checking the existence of mandatory
flags.
    @keiichiw
    keiichiw committed Dec 15, 2021
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  2. Don't use "help" as sample data unrelated to helpflag() 

    Since `helpflag()` method was added, we shouldn't use "help" as a
placeholder in tests unrelated to the helpflag() method.
    @keiichiw
    keiichiw committed Dec 15, 2021
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