Django-multidb-router

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- Deprecate master/slave terminology and switch to replica. 44
- Fix bug and warn when REPLICA_DATABASES is not defined. 39
- Drop support of Python 3.4. 43 etc
- Confirm support of Python 3.7
- Drop support of Django 1.8
- Drop support of Django 1.10
- Confirm support of Django 2.0
- Confirm support of Django 2.1

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- Dropped support for Python 3.3
- Added support for modern django MIDDLEWARE setting, keeping
backwards-compatibility

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- Added support for Django up to 1.11
- Dropped official support for Django 1.7 and lower

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- Support for Django 1.7
- Support for Python 3