This is a fork of archive/zip from the standard library with a number
of bugfixes:

* Support extra bytes before zip file (see issue https://github.com/golang/go/issues/10464)

Includes patch by Phil Webb philwebb https://github.com/philwebb/go/commit/b1b65c2b4cd85f1a67c3c5c8cf40254030c7cab4
