- Added support for multi-constraints dependencies.
- Added a cache version system.
- Added a `--lock` option to `update` to only update the lock file without executing operations.
- Added a `--lock` option to `update` to only update the lock file without executing operations. (Thanks to [@greysteil](https://github.com/greysteil))
- Added support for the `Project-URL` metadata.
- Added support for optional scripts.
- Added a `--no-dev` option to `show`. (Thanks to [@rodcloutier](https://github.com/rodcloutier))
