chore: update clap requirement from 2 to 4

[dependabot]

Updates the requirements on clap to permit the latest version.

Release notes

Sourced from clap's releases.

v4.0.2

[4.0.2] - 2022-09-28

Fixes

• (parser) SetFalse should conflict with itself like SetTrue and Set
• (parser) Allow one-off overrides

Changelog

Sourced from clap's changelog.

[4.0.2] - 2022-09-28

Fixes

• (parser) SetFalse should conflict with itself like SetTrue and Set
• (parser) Allow one-off overrides

[4.0.1] - 2022-09-28

Fixes

• (derive) Ensure #[clap(...)] attribute still works

[4.0.0] - 2022-09-28

Highlights

Arg::num_args(range)

Clap has had several ways for controlling how many values will be captured without always being clear on how they interacted, including

• Arg::multiple_values(true)
• Arg::number_of_values(4)
• Arg::min_values(2)
• Arg::max_values(20)
• Arg::takes_value(true)

These have now all been collapsed into Arg::num_args which accepts both single values and ranges of values. num_args controls how many raw arguments on the command line will be captured as values per occurrence and independent of value delimiters.

See Issue 2688 for more background.

Polishing Help

Clap strives to give a polished CLI experience out of the box with little ceremony. With some feedback that has accumulated over time, we took this release as an opportunity to re-evaluate our --help output to make sure it is meeting that goal.

In doing this evaluation, we wanted to keep in mind:

• Whether other CLIs had ideas that make sense to apply
• Providing an experience that fits within the rest of applications and works across all shells

Before:

git
A fictional versioning CLI
USAGE:
</tr></table>

... (truncated)

Commits

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