Update geoip2 to 4.8.0

[pyup-bot]

This PR updates geoip2 from 4.5.0 to 4.8.0.

Changelog

4.8.0

++++++++++++++++++

* IMPORTANT: Python 3.8 or greater is required. If you are using an older
version, please use an earlier release.
* The ``is_anycast`` attribute was added to ``geoip2.record.Traits``.
This returns ``True`` if the IP address belongs to an
`anycast network <https://en.wikipedia.org/wiki/Anycast>`_.
This is available for the GeoIP2 Country, City Plus, and Insights web services
and the GeoIP2 Country, City, and Enterprise databases.

4.7.0

++++++++++++++++++

* IMPORTANT: Python 3.7 or greater is required. If you are using an older
version, please use an earlier release.

4.6.0

++++++++++++++++++

* The ``AddressNotFoundError`` class now has an ``ip_address`` attribute
with the lookup address and ``network`` property for the empty network
in the database containing the IP address. These are only available
when using a database, not the web service. Pull request by illes.
GitHub 130.

Links

• PyPI: https://pypi.org/project/geoip2
• Changelog: https://data.safetycli.com/changelogs/geoip2/
• Docs: https://pythonhosted.org/geoip2/