Update django-extensions to 3.0.8

[pyup-bot]

This PR updates django-extensions from 3.0.5 to 3.0.8.

Changelog

3.0.8

Changes:
- Improvement: setup.cfg, remove universal flag from wheel, we only support Python 3 and up
- Improvement: sqlcreate, fixed mentioned of old syncdb
- Fix: runserver_plus, stop catching SyntaxError since reload for it was not working properly

3.0.7

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Changes:
- Improvement: runserver_plus, gh 1575 survive syntax and configuration errors
- Improvement: runscript, use exit-code 1 if script is not found

3.0.6

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Changes:
- Improvement: runscript, add --continue-on-error unless set runscript will exit on errors
- Improvement: runscript, allow to return exit-code
- Improvement: runscript, support raise CommandError(... returncode=...)
- Improvement: runscript, run Django checks() and check_migrations() before executing scripts
- Improvement: shell_plus, set application name on all postgresql backends

Links

• PyPI: https://pypi.org/project/django-extensions
• Changelog: https://pyup.io/changelogs/django-extensions/
• Repo: http://github.com/django-extensions/django-extensions

[pyup-bot]

Closing this in favor of #262