Please update zip dependency to 5.1.1

[nadzyah]

I am in the process of packaging this crate for Debian. I noticed that it depends on zip version 0.6.3, while the latest release of zip is 5.1.1

The API has changed significantly since 0.6, which means I cannot simply relax the dependency in the Debian package without patching the code. If the crate could be updated to use zip = 5.1.1, it would make introducing and maintaining the package in Debian much easier, and would also make the project compatible with the latest upstream zip release