Update geoip2 to 4.7.0

[pyup-bot]

This PR updates geoip2 from 4.5.0 to 4.7.0.

Changelog

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://pyup.io/changelogs/geoip2/
• Homepage: http://www.maxmind.com/
• Docs: https://pythonhosted.org/geoip2/

[pyup-bot]

Closing this in favor of #278