Django-behaviors

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* Feature: ``Slugged`` behavior now supports non-unique slugs (thanks vonmaster)

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* Drop Django 2.0 support and Python 3.4 support as they have reached EOL
* Add Django 2.1, 2.2 and Python 3.7 support
* Feature: Add db_index to ``Timestamped`` behavior's ``modified`` field (thanks kazqvaizer)

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* Feature: Add ``StoreDeleted`` behavior to soft delete models (thanks abekroenem)

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* Update setup.py classifiers

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* Add Django 2.0 and Python 3.6 Support

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* Add ``Slugged`` behavior adding a slug to models
* Update documentation