Missing fields versionMadeBy and internalFileAttributes

[kmalakoff]

I am trying to port my usage from yauzl to node-unzipper. In order to handle symlinks properly, I need the following fields:

1. versionMadeBy

2. internalFileAttributes

Would you be open to add them to your library? I took a look at the changes needed, but I'm not sure why the first item is versionsNeededToExtract rather than versionMadeBy so I'm not sure how to proceed.

Here's my library for reference for a sense of the parameters needed.

Let me know if you can unblock me to create a pull request or if you want to make the change yourself. Thank you!