Placeholder reserving the `koban-cli` name on crates.io for the
[koban](https://github.com/jamesbrink/koban) Invoice Ninja command-line tool.
The first real release will be published as `0.1.0` and installs a `koban`
binary (`cargo install koban-cli`). The reusable API client lives in the
[`koban`](https://crates.io/crates/koban) library crate.