Move to clap@3 from structopt

[mainrs]

I've been using clap@3 on some smaller personal projects. It's still in development but it integrates structopt into it. We should switch at some point.

[koiuo]

I have a free evening and miss writing Rust, so I'm thinking about giving this a try, but on the clap gh page I see this warning

We recommend users to not update to the prerelease version yet and to wait for the official 3.0.

Do you indeed want to use 3.0.0-beta2 ?

[mainrs]

Hm good point. Honestly, I haven't had any problems with beta1 and beta2. I had zero breaking changes during both stages.

Maybe waiting and doing one larger refactor is the better approach. They still can introduce breaking changes (and already have) inside their beta releases.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.