Djangoql

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* ``write_tables`` argument for PLY parser is now disabled by default. This
change prevents an error that may arise if DjangoQL is installed into
un-writeable location (63, 53. Thanks to sochotnicky for the PR);
* fixed quotes handling in completion widget (62, thanks to nicolazilio for
reporting this);

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* add basic support for models.BinaryField (thanks to Akay7);

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* fixed inconsistency in search by fields with choices (58, thanks to
pandichef for reporting this);
* Officially compatible with Python 3.9 (no changes in the code, just added it
to the test matrix);

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* New feature: field suggestion options are now loaded asynchronously via
Suggestions API;
* **Breaking**: ``DjangoQLField.get_options()`` now accepts mandatory ``search``
parameter. If you've implemented custom suggestion options for your schema,
please add handling of this parameter (you should only return results that
match ``search`` criteria);
* **Breaking**: when using in the admin together with the standard Django
search, DjangoQL checkbox is now on by default. If you don't want this
behavior, you can turn it off with ``djangoql_completion_enabled_by_default``
option. Thanks to nicolazilio for the idea;
* Deprecated: if you've used ``DjangoQLSchema.as_dict()`` somewhere in your
code, please switch to new schema serializers instead (see in
``serializers.py``);
* Improved field customization examples in the docs (55, thanks to
joeydebreuk);
* Added support for Django 3.1.x (57, thanks to jleclanche)

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* Fixed compatibility with upcoming Django 3.0 (thanks to vkrizan for the
reminder);

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* Added "DjangoQL syntax help" link to the error messages in Django admin
(thanks to AngellusMortis for the idea);