Create zip with empty directory

[ryan lin]

For example, I just want to create empty directory named test, the following code does not work.

zipSync({
  test: {}
})

[101arrowz]

This is probably something that should be supported for consistency, but you can do this instead:

zipSync({
  'test/': new Uint8Array(0)
})

[101arrowz]

Added support for the original syntax in v0.7.3. Thanks for the feature request!