Remove docopt workaround #4174
Description
After the next docopt release, we should replace the struct here with an actual unit struct: https://github.com/rust-lang/cargo/blob/master/src/bin/version.rs#L7.
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After the next docopt release, we should replace the struct here with an actual unit struct: https://github.com/rust-lang/cargo/blob/master/src/bin/version.rs#L7.