Update jsonfield to 3.1.0

[pyup-bot]

This PR updates jsonfield from 2.0.2 to 3.1.0.

Changelog

3.1.0

^^^^^^^^^^^^^^^^^
- Handle loading invalid JSON from db
- Remove default ``help_text`` string
- Change form field to render non-ascii values
- Add setuptoools ``python_requires`` check
- Add README section on querying and null value handling
- Improve test suite coverage

3.0.0

^^^^^^^^^^^^^^^^^
This release is a major rewrite of ``jsonfield``, merging in changes from the
``jsonfield2`` fork. Changelog entries for ``jsonfield2`` are included below
for completeness.

- Add source distribution to release process
- Update ``JSONEncoder`` from DRF
- Fix re-rendering of invalid field inputs
- Fix form field cleaning of string inputs
- Fix indentation for ``Textarea`` widgets
- Allow form field error message to be overridden
- Obey form ``Field.disabled``

jsonfield2 v3.1.0 12/06/2019
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Fix use with ``select_related`` across a foreign key
- Fix field deconstruction
- Drop Python 3.5 support
- Drop Django 2.1 (and below) support

jsonfield2 v3.0.3 10/23/2019
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Add Python 3.8 & Django 3.0 support
- Drop Python 3.4 support

jsonfield2 v3.0.2 12/21/2018
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Add Python 3.7 & Django 2.1 support

jsonfield2 v3.0.1 05/21/2018
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Fix model full_clean behavior

jsonfield2 v3.0.0 05/07/2018
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- Add Django 2.0 support
- Drop Django 1.8, 1.9, and 1.10 support
- Drop Python 2.7 and 3.3 support
- Rework field serialization/deserialization
- Remove support for South
- Rename JSONFieldBase to JSONFieldMixin
- Move form fields into separate module
- Rename JSONFormFieldBase to forms.JSONFieldMixin
- Rename JSONFormField to forms.JSONField
- Remove JSONCharFormField
- Update JSONEncoder from DRF

Links

• PyPI: https://pypi.org/project/jsonfield
• Changelog: https://pyup.io/changelogs/jsonfield/
• Repo: https://github.com/rpkilby/jsonfield/