cargo-lock 3.0.0

Self-contained Cargo.lock parser with optional dependency graph analysis
Documentation
## [3.0.0] 2019-10-01

- Support `[package.dependencies]` without versions ([#23])

## [2.0.0] 2019-09-25

- Use two-pass dependency tree computation ([#20])
- Remove `Lockfile::root_package()` ([#18])

## [1.0.0] 2019-09-24

- dependency/tree: Render trees to an `io::Write` ([#16])
- metadata: Generalize into `Key` and `Value` types ([#14])
- Refactor dependency handling ([#11])

## [0.2.1] 2019-09-21

- Allow empty `[metadata]` in Cargo.lock files ([#9])

## [0.2.0] 2019-09-21

- dependency_graph: Move `petgraph` types into a module ([#7])

## [0.1.0] 2019-09-21

- Initial release

[3.0.0]: https://github.com/RustSec/cargo-lock/pull/24
[#23]: https://github.com/RustSec/cargo-lock/pull/23
[2.0.0]: https://github.com/RustSec/cargo-lock/pull/21
[#20]: https://github.com/RustSec/cargo-lock/pull/20
[#18]: https://github.com/RustSec/cargo-lock/pull/18
[1.0.0]: https://github.com/RustSec/cargo-lock/pull/17
[#16]: https://github.com/RustSec/cargo-lock/pull/16
[#14]: https://github.com/RustSec/cargo-lock/pull/14
[#11]: https://github.com/RustSec/cargo-lock/pull/11
[0.2.1]: https://github.com/RustSec/cargo-lock/pull/10
[#9]: https://github.com/RustSec/cargo-lock/pull/9
[0.2.0]: https://github.com/RustSec/cargo-lock/pull/8
[#7]: https://github.com/RustSec/cargo-lock/pull/7
[0.1.0]: https://github.com/RustSec/cargo-lock/pull/5