clap_derive 3.0.0-rc.6

Parse command line argument by defining a struct, derive crate.
Documentation
# clap_derive

Macro implementation for clap's derives.

See [docs.rs](https://docs.rs/clap).

## License

Licensed under either of

- Apache License, Version 2.0 ([LICENSE-APACHE]LICENSE-APACHE or <https://www.apache.org/licenses/LICENSE-2.0>)
- MIT license ([LICENSE-MIT]LICENSE-MIT or <https://opensource.org/licenses/MIT>)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

See [CONTRIBUTING](CONTRIBUTING.md) for more details.