Undefined property: $need_headers

I am seeing the following notice:

```Notice: Undefined property: Barracuda\ArchiveStream\ZipArchive::$need_headers in /tmp/test/vendor/barracudanetworks/archivestream-php/src/Archive.php on line 323```

Looking at the code, it doesn't look like the $need_headers property is being declared.

Thanks for your help.
