`--help` command line argument
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Although asciidoctor-pdf it's fairly simple to use, I don't like the error I get when I run asciidoctor-pdf --help xD.
The plan is to integrate this converter as a proper Asciidoctor backend, in which case you'd use the asciidoctor command to invoke it. If we do decide to keep the asciidoctor-pdf command, we need to switch to using a proper CLI framework, at which point we'd surely add a --help flag.