ghbu 0.1.0

Backup your GitHub Repositories
Documentation
# `ghbu`: GitHub Backup

## Design

Usage (backup the repositories owned by the user with the given `GITHUB_TOKEN`
to `~/github-backup`, access by the given SSH key): 

    $ GITHUB_TOKEN=0123abc ghbu --to ~/github-backup --keyfile ~/.ssh/id_ed25519

## Dependencies

- [`git2`]https://docs.rs/git2/latest/git2/: clone and fetch Git repositories
- [`reqwest`]https://crates.io/crates/reqwest: request repositories from GitHub API
- [`serde_json`]https://crates.io/crates/serde_json: unmarshal GitHub API payloads
- [`clap`]https://crates.io/crates/clap: parse command line arguments

## TODO

- [ ] Refactoring
    - [ ] get rid of `unwrap()` calls
    - [ ] restructure code
- [ ] Concurrency
    - [ ] interleave API calls with cloning/fetching of repositories
- [ ] Extension
    - [ ] implement for GitLab API
    - [ ] implement for Gitea API
    - [ ] clone an organization's repositories, too