Update djangorestframework-gis to 0.14

[pyup-bot]

This PR updates djangorestframework-gis from 0.12.0 to 0.14.

Changelog

0.14.0

---------------------------

- `173 <https://github.com/djangonauts/django-rest-framework-gis/pull/173>`_:
added support for django 2.1, DRF 3.9 and switched to django-filters >= 2.0
(**which requires python >= 3.4**)
- `178 <https://github.com/djangonauts/django-rest-framework-gis/pull/178>`_:
simplified ``setup.py`` and tox build

0.13.0

---------------------------

- `161 <https://github.com/djangonauts/django-rest-framework-gis/pull/161>`_:
added flag to reduce precision of ``GeometryField``
- `164 <https://github.com/djangonauts/django-rest-framework-gis/pull/164>`_:
added compatibility with django-rest-framework 3.8

Links

• PyPI: https://pypi.org/project/djangorestframework-gis
• Changelog: https://pyup.io/changelogs/djangorestframework-gis/
• Repo: https://github.com/djangonauts/django-rest-framework-gis/releases

[coveralls]

Coverage remained the same at 71.137% when pulling 01466e0 on pyup-update-djangorestframework-gis-0.12.0-to-0.14 into 22219cb on master.

[chris48s]

done in #1428