[Casing] Change default from verbatim to kebab.

[0ndorio]

.. fixes #202

I hope I discovered all related comments and text snippets.

[TeXitoi]

Thanks. Will try to review today.

Please update the changelog.

[0ndorio]

Thanks. Will try to review today.

Please update the changelog.

Done. Listed it inside the Breaking Changes category.

[TeXitoi]

Sorry to not been explicit enough: can you add a note in the changelog explaining how to have the same behavior as before, for ease of upgrading? Thanks.

That's basically adding #[structopt(rename_all = "verbatim") where you have #[derive(StructOpt)]

[TeXitoi]

Please improve the documentation at the begining of lib.rs, explaining that, by default, long, short name and commands without explicit name will be renamed using kebab-case if rename-all is not specified.

Else, everything looks good, thanks!

[0ndorio]

Please improve the documentation at the begining of lib.rs, explaining that, by default, long, short name and commands without explicit name will be renamed using kebab-case if rename-all is not specified.

Else, everything looks good, thanks!

Updated the change log and added an additional paragraph to describe the behavior (I hope it's in the right place).

[TeXitoi]

Thanks!