I am learning rust and reading the book for the first time in https://github.com/rust-lang/rust/blob/9094935b460975b6fac272ebf5985dfd71b90104/src/doc/book/getting-started.md#making-a-new-cargo-project-the-easy-way the generated `Cargo.toml` has changed slight difference is that it has a section called `[dependencies]` should we specify the actual file ?