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Update README.md
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@at-grandpa
at-grandpa authored Dec 25, 2018
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### help_template

You can customize the help message. The `help_template` block needs to return `String`. Block arguments are `desc : String`, `usage : String`, `options : HelpOptionsType` and `sub_commands : HelpSubCommandsType`.
You can customize the help message by `help_template` block. It must be placed in main block. Also it needs to return `String`. Block arguments are `desc : String`, `usage : String`, `options : HelpOptionsType` and `sub_commands : HelpSubCommandsType`.

*help_template_test.cr*

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