First directory stripped when flatten is false

[Lars den Bakker]

Followup from #36

The new flatten option when set to false doesn't work as expected. The first directory is stripped so the new directory structure doesn't represent the original directory structure.

A workaround is to add the directory name manually in the destination, but that doesn't work if the parent directory is a glob as well.

[Lars den Bakker]

@vladshcherbin would you accept a PR to fix this?

[Vlad Shcherbin]

@LarsDenBakker sure, go for it