Geoip2

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* 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.

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

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* 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.

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* Support for mobile country code (MCC) and mobile network codes (MNC) was
added for the GeoIP2 ISP and Enterprise databases as well as the GeoIP2
City and Insights web services. ``mobile_country_code`` and
``mobile_network_code`` attributes were added to ``geoip2.model.ISP``
for the GeoIP2 ISP database and ``geoip2.record.Traits`` for the
Enterprise database and the GeoIP2 City and Insights web services.
We expect this data to be available by late January, 2022.

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* The public API on ``geoip2.database`` is now explicitly defined by
setting ``__all__``.
* The return type of the ``metadata()`` method on ``Reader`` is now
``maxminddb.reader.Metadata`` rather than a union type.

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* Previously, the ``py.typed`` file was not being added to the source
distribution. It is now explicitly specified in the manifest.
* The type hints for the database file in the ``Reader`` constructor have
been expanded to match those specified by ``maxmindb.open_database``. In
particular, ``os.PathLike`` and ``IO`` have been added.
* Corrected the type hint for the ``metadata()`` method on ``Reader``. It
will return a ``maxminddb.extension.Metadata`` if the C extension is being
used.