feat: support single dash as positional #49
Merged
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We need to do "something" with a single dash, and I think it is appropriate to treat it as a positional.
The canonical use is as per the README, a shortcut for stdin/stdout (depending on context).
(I speculate the README said "no" more because didn't want to commit to how it would be handled than because it shouldn't be a positional.)
For prior art, Commander allows single dash as a positional and also as an option value. This PR only addresses the positional, partly as less likely to be controversial, but also because less likely to conflict with other open Pull Requests!