Django-multisite

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* Fix tldextract version 3.0.0 breaking changes (Issue 72 / PR 74)
* Fix test requirements missing Django
* Fix Pluggy dependency version conflict
* Remove support for Python 3.5 / Django < 1.11

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- Support for Django 3.0 (PR 68 - thanks erikvw)
- Fix middleware usage post Django 2.0 (PR 69 thanks mihalikv)

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* Support Django 2.1 and 2.2 (PR 59 - thanks ribeiroti!)
* Replace queryset with get_queryset in admin (PR 61 - thanks vit-ivanov!)

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* Fix KeyError from _get_site_by_id
* Drop support for Django 1.7
* Remove unnecessary cache type warnings
* Remove deprecated SiteIDHook

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* Support Django 2.0 (PR 47 and 60)
* Remove code for Django < 1.7
* Remove obsolete PathAssistedCurrentSiteManager
* Remove obsolete template.loaders.cached
* Update README to better describe local development setup

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* Specify Django <2.0 in setup.py
* Drop support for python 3.3