Bump django-bootstrap3 from 9.0.0 to 15.0.0

[dependabot-preview[bot]]

Bumps django-bootstrap3 from 9.0.0 to 15.0.0.

Changelog

Sourced from django-bootstrap3's changelog.

15.0.0 - 2021-04-10

• Drop support for Django 3.0, extended support stopped on 2021-04-01).
• Add support for Django 3.2.
• Fix render_alert (#488)
• Rename AUTHORS.md to AUTHORS, remove authors section from documentation.
• Revert to setuptools for packaging.
• Add docs and tests to sdist (#494).
• Use GitHub Actions for CI.

14.2.0 - 2020-10-13

• Reformat CHANGELOG.
• Fix Django 3.1 warning in test app settings.
• Update black.
• Replace m2r with m2r2 to support Sphinx3.
• Add Python 3.9 to test matrix.

14.1.0 - 2020-07-02

• Fix coveralls.
• Explicitly support Django 3.1 in tox matrix.

14.0.0 - 2020-06-22

• Drop support for Python 3.5 and Django 2.1.
• Use Poetry (https://python-poetry.org/) for dependency management and packaging.
• Change documentation to support main branch rename to 'main'.
• Fix settings override bug (fixes #388).
• Use Markdown for README.
• Fix Travis, ReadTheDocs and tox configurations.
• Update Makefile with lessons learned from other packages.

12.1.0 - 2020-05-01

• Distinguish between help text and errors (fixes #479)

12.0.3 - 2019-12-21

• Update changelog

12.0.2 - 2019-12-21

• Revert of #453, which turned out to break checkboxes (fixes #467)
• Update requirements and fix make docs
• Replace force_text with force_str, removes warnings

12.0.1 - 2019-12-12

• Reinstate bootstrap3.__version__ (fixes #486)

... (truncated)

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