Simple-locations

What's Changed
* Feature manager by joshbrooks in https://github.com/catalpainternational/simple_locations/pull/37


**Full Changelog**: https://github.com/catalpainternational/simple_locations/compare/v3.1.7...v4.0.0

**New Models**

This is a comprehensive update to `simple_locations` which includes tests, lots of `codestyle` things, typing.
Minimum Python version is now 3.7.

This release adds additional models `Border`, which is intended to relate the shared segments of lines like a Topology would, and `ProjectedArea` which has the Area transformed to 3758 for compatibility with OpenStreetMap data

**Full Changelog**: https://github.com/catalpainternational/simple_locations/compare/2.78...v3.1.5

Translatable models (optional)
Refactors admin inheritance.

Not compatible with moedltranslations < 0.13.1 due to a modeltranslations bug.

Minor fix to allow `health_service` to look up `simple_locations` Area objects using FKAutocompleAdmin.
This fixes editing HealthFacility objects in `health_service` in Django's Admin.

This is a post-release for what's currently on pypi
This release fixes some incompatibilities with Django 1.11 in order for openly projects to be able to use new features of Django.