Modify according to git-down, Supplemented test cases, and more convenient to be called.

lets you download one or multiple directories from a Git repository.

Usage

```rs use download_git;

downloadgit::download("https://github.com/twbs/bootstrap.git:main", downloadgit::DownloadOptions { targetfiles: Some(vec!["dist".tostring(), "README.md".tostring()]), destpath: String::from(TEST_FOLDER) }).unwrap();

```

License

MIT