Minor bug

[OptimisticPeach]

A few commits were published about 17 days ago from the day of posting this issue, one of which is this one, they work on adding rust 2018 support to cargo-apk, but unfortunately there hasn't been any more updates on this, and they don't compile, or have been released. In my specific case, a dependent crate requires another with the version being = "*", and said double-dependent crate has already migrated to rust 2018, therefore making it impossible to use cargo-apk with the crate I'm depending on. The actual problem here is that there is a minor bug in the clap use, that makes CLI take cargo apk build as if apk was what was being called, and so a workaround for now is to just call cargo-apk build or whatever sub-command is being used.