Bump django-extensions from 2.1.6 to 2.2.8

[dependabot-preview]

Bumps django-extensions from 2.1.6 to 2.2.8.

Changelog

Sourced from django-extensions's changelog.

2.2.8

Changes:

• Locale: zh_Hans, removed as it generated UnicodeDecodeError errors (#1478)

2.2.7

Changes:

• Improvement: shell_plus, #865 always add manage.py basedir to path for notebook kernel
• Improvement: docs, add zh-Hans locale
• Improvement: runserver_plus, fix broken import for werkzeug v1.0.0
• Improvement: runserver_plus, #1461 fix always trying to load StaticFilesHandler
• Improvement: pipchecker, #1471 fix import of PipSession

2.2.6

Changes:

• Improvement: travis, update pypy and pypy3 versions
• Improvement: shell_plus, ability to print location/traceback besides sql
• Improvement: runserver_plus, ability to print location/traceback besides sql
• Improvement: UniqueFieldMixin, Support Django 2.2 UniqueConstraint.condition
• Improvement: DEFAULT_MYSQL_ENGINES, add mysql.connector.django
• Improvement: shell_plus, allow setting SHELL_PLUS="notebook"
• Improvement: shell_plus, add -c/--command to shell_plus mirroring django's shell command
• Fix: shell_plus, fix postgresql debug wrapper on django 3.0 or higher
• Fix: runserver_plus, fix postgresql debug wrapper on django 3.0 or higher

2.2.5

Changes:

• Improvement: travis, add Python 3.8
• Improvement: setup.py, update classifiers

2.2.4

Changes:

• Improvement: RandomCharField, Support unique_together
• Improvement: export_emails, add settings for overriding queryset fields, order_by and the full_name function

2.2.3

... (truncated)

Commits

• eb79c30 v2.2.8
• cf0f845 remove zh_Hans for now (see #1478)
• 534e0d0 bumped version number
• 20242e7 v2.2.7
• 5dd14bd Merge pull request #1477 from jugmac00/fix-broken-import
• 928ebe3 Fix broken import
• 0ad61ae cleanup, reorganize and more clearly list supported versions
• ee1c7b9 fix #1471 import of PipSession
• e99eb9c fix #1461 always try to load StaticFilesHandler
• aaf5c69 remove staticfiles
• Additional commits viewable in compare view

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