Django-graphql-geojson

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* Upgraded graphene-django requirement to v2.1rc0

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* Added descriptions
* Fixed resolvers in inheritance

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* Added Graphene FILTER_DEFAULTS to GeometryFilterSet

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* Allowed multiple geojson models

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* Added distance filters
* Added filter fields support for GeoJSONTpe
* Added Properties resolve methods
* Fixed bbox resolver for null fields

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* CRITICAL: Renamed GeoJSONInput to Geometry
* GeometryFilterSet
* Import types