Djangoql

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* fixed ``django-completion`` bug related to removed chained models from
suggestions;
* fixed ``django-completion`` bug related to fixed circular dependencies.

Related pull requests:

* `https://github.com/ivelum/djangoql-completion/pull/2 <https://github.com/ivelum/djangoql-completion/pull/2>`_
* `https://github.com/ivelum/djangoql/pull/77 <https://github.com/ivelum/djangoql/pull/77>`_

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* fixed regression for Django < 2.1 (thanks to derekenos for reporting the
issue);

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* fixed ``url()`` deprecation warnings for Django 3.1+ (thanks to ecilveks);

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* the completion JavaScript widget has been moved to
`its own repo <https://github.com/ivelum/djangoql-completion>`_ and is now
available as a standalone
`package on npm <https://www.npmjs.com/package/djangoql-completion>`_. It
still ships with the Python package, though, so if you don't need to embed
the completion widget in your custom JavaScript application, no additional
installation steps are required;
* added support for GenericIPAddressField (thanks to HannaShalamitskaya for
reporting the issue);
* the source code is now linted with flake8 and isort;

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* added a help text to some operators;
* fixed the background color in the dark mode (django 3.2+);

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* add ``~`` operator for date/datetime fields;