Django-formidable

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- HOTFIX: Allow empty values for ``defaults`` properties (391).

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- DOC: removed ``setup.py`` Python2-related classifiers (380).
- Fix the support for conditions when their trigger field is a multiple choice field (381).

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- Drop support for Python 2.7 -- EOL: January 1st, 2020 (377).
- Added an XSS prevention mechanism. See the `security documentation <https://django-formidable.readthedocs.io/en/master/>`_ for more information and details on how to setup your own sanitization process (#378).
- Removed ``tox.ini`` directive that skipped missing Python interpreters (376).

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- Add support to Django 2.2 (326).
- Add support to Python 3.7 & 3.8 (374).

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- Extend the test matrix to spread through different DRF versions.
- Drop support for Django 1.10 (EOL was in December 2nd, 2017).
- Launch tests on Postgresql as well as SQLite. Launching these tests will be possible both locally and on Circle-CI. See the "dev" documentation on how you can run tests on your development environment (161).
- Add ``select_for_update()`` on selection in querysets when the Form is about to be modified (namely ``PUT`` & ``PATCH`` views). This could prevent Database deadlocks when several changes are attempted on the same **large** form.
- Upgrade to swagger-ui 3.23.11 (371 & 367).

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- Fix documentation build (363).
- Upgrade requirements to Django REST Framework 3.9.x.