Update documentation for ZipArchive

[tacman]

Searching the Flysystem Documentation for ZipArchive shows the results below.

The first link is to version 1, which doesn't work anymore:

https://flysystem.thephpleague.com/v1/docs/adapter/zip-archive/#article

The second link is a reference to the moved adapters:

https://flysystem.thephpleague.com/v1/docs/advanced/upgrade-to-1.0.0/#relocated-adapters

But the link under "Relocated Adapters" for ZipArchive is broken:

https://flysystem.thephpleague.com/docs/adapter/zip-archive/

I've submitted a PR for the README in zip-archive, but some documentation would be very helpful. Is ZipArchive still officially supported?

https://flysystem.thephpleague.com/docs/

Thanks.