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Summary
Closes #324.
This is my first time writing Rust, please let me know if you have a preference for something else.
Followed the example here: https://github.com/clap-rs/clap/blob/master/clap_complete/examples/completion-derive.rs
I was hoping to also disable completion of the short version of each flag, prevent completion of flags until at least one hyphen was typed, and provide custom completion suggestions, but I don't think clap_complete supports those features yet.
Preflight checklist
$ cargo fmt
)$ cargo clippy
)