Closes #224

Not all Python versions are available on 22.04[1] and our CI is
currently not working because of that.

[1] actions/setup-python#544 (comment)

* Get the CI running again

It's currently failing because:

* Python 2.7 is no longer supported[1]
* setup-python v2 can't find PyPy3.6 on Mac, I think upgrading to v4
  will help

Upgrading setup-python to v4 requires us to change how to refer to PyPy
– we have to specify the actual version now.

[1] actions/setup-python#672

When you go to [1] for example you'll see we have twice as many CI jobs
compared to what we expect (36 instead of 18).

Let's only run "push" jobs on master.

[1] #260

To ensure that we're compatible, without the CI running these versions
we don't know.

It's been EOL for a while.

Just a small typo fix

With existing files in place at least recent wget versions download to
files named oui.txt.1 and so on.

Let's force wget to write to the files we want.

The result of running "make download".

This is a cherry pick of commit [1] later temporarily reverted in [2] to
unblock the 0.8.0 release.

The original commit message:

    Like RFC 3021, IPv6 defines point-to-point subnets that must
    be handled separately, i.e. don't reserve first IP address.

    This patch aims to implement this, while refactoring code in
    iter_host function to reduce code duplication.

    Tests for this feature also added to ensure there is no regression.

    Signed-off-by: Damien Claisse <d.claisse@criteo.com>

We're preparing 0.9.0 release so this can land again (for good this
time).

[1] 2984c0a ("Handle RFC 6164 IPv6 addresses")
[2] 67f1992 ("Revert "Handle RFC 6164 IPv6 addresses"")

Co-authored-by: Damien Claisse <d.claisse@criteo.com>

We've had something like that before and it didn't play well with PyPI
so I reverted it[1].

Let's see if it works any better now.

[1] 6401dee ("Un-revert "- PKG-INFO metadata generation seems to be broken (lists maintainer as author on PyPI - mutually exclusive?)""")