Django-request-position

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* Fixed problem with IP from ``HTTP_X_FORWARDED_FOR``

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* Fixed error wile providing a IP that does not exists.

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* Added ``geoip2`` requirement.

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* Support for Django 2.0.

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* Fixed settings variables prefix.
* Fixed problem with default REQUEST_POSITION_DEFAULT_COUNTRY_CODE value.
* Added settings variables to README.

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* Fixed problem with missing REMOTE_ADDR_ATTR setting variable.