Update django-debug-toolbar to 3.0

[pyup-bot]

This PR updates django-debug-toolbar from 2.2 to 3.0.

Changelog

3.0

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

* Added an ``.editorconfig`` file specifying indentation rules etc.
* Updated the italian translation.
* Added support for Django 3.1a1. ``fetch()`` and ``jQuery.ajax`` requests are
now detected by the absence of a ``Accept: text/html`` header instead of the
jQuery-specific ``X-Requested-With`` header on Django 3.1 or better.
* Pruned unused CSS and removed hacks for ancient browsers.
* Added the new :attr:`Panel.scripts <debug_toolbar.panels.Panel.scripts>`
property. This property should return a list of JavaScript resources to be
loaded in the browser when displaying the panel. Right now, this is used by a
single panel, the Timer panel. Third party panels can use this property to
add scripts rather then embedding them in the content HTML.
* Switched from JSHint to ESLint. Added an ESLint job to the Travis CI matrix.
* Debug toolbar state which is only needed in the JavaScript code now uses
localStorage.
* Updated the code to avoid a few deprecation warnings and resource warnings.
* Started loading JavaScript as ES6 modules.
* Added support for ``cache.touch()`` when using django-debug-toolbar.
* Eliminated more inline CSS.
* Updated ``tox.ini`` and ``Makefile`` to use isort>=5.
* Increased RESULTS_CACHE_SIZE to 25 to better support AJAX requests.
* Fixed the close button CSS by explicitly specifying the
``box-sizing`` property.
* Simplified the ``isort`` configuration by taking advantage of isort's
``black`` profile.
* Added HistoryPanel including support for AJAX requests.

**Backwards incompatible changes**
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Loading panel content no longer executes the scripts elements embedded in the
HTML. Third party panels that require JavaScript resources should now use the
:attr:`Panel.scripts <debug_toolbar.panels.Panel.scripts>` property.
* Removed support for end of life Django 1.11. The minimum supported Django is
now 2.2.

Links

• PyPI: https://pypi.org/project/django-debug-toolbar
• Changelog: https://pyup.io/changelogs/django-debug-toolbar/
• Repo: https://github.com/jazzband/django-debug-toolbar

[coveralls]

Coverage remained the same at 76.186% when pulling ae4f4de on pyup-update-django-debug-toolbar-2.2-to-3.0 into 9646aeb on master.