Bump django-constance from 2.2.0 to 2.6.0

[dependabot-preview[bot]]

Bumps django-constance from 2.2.0 to 2.6.0.

Changelog

Sourced from django-constance's changelog.

v2.6.0 (2020/01/29)

• Drop support py<3.5 django<2.2
• Set pickle protocol version for the Redis backend
• Add a command to delete stale records

v2.5.0 (2019/12/23)

• Made results table responsive for Django 2 admin
• Add a Django system check that CONFIG_FIELDSETS accounts for all of CONFIG
• Rewrite set() method of database backend to reduce number of queries
• Fixed "can't compare offset-naive and offset-aware datetimes" when USE_TZ = True
• Fixed compatibility issue with Django 3.0 due to django.utils.six
• Add Turkish language

v2.4.0 (2019/03/16)

• Show not existing fields in field_list
• Drop Django<1.11 and 2.0, fix tests vs Django 2.2b
• Fixed "Reset to default" button with constants whose name contains a space
• Use default_storage to save file
• Allow null & blank for PickleField
• Removed Python 3.4 since is not longer supported

v2.3.1 (2018/09/20)

• Fixes javascript typo.

v2.3.0 (2018/09/13)

• Added zh_Hans translation.
• Fixed TestAdmin.test_linebreaks() due to linebreaksbr() behavior change on Django 2.1
• Improved chinese translation
• Fix bug of can't change permission chang_config's name
• Improve consistency of reset value handling for date
• Drop support for Python 3.3
• Added official Django 2.0 support.
• Added support for Django 2.1

Commits

• 0ed37e4 Bump version
• 8f20ca3 command-to-delete-stale-records (#355)
• b62206d Resolve #367: Set pickle protocol version for the Redis backend (#369)
• 590fa02 Drop support py<3.5 django<2.2 (#359)
• 886f6d5 Improve documentation. Fixes #304
• 0e94d13 Bump version
• 288ca7c Add Turkish language support (#353)
• 917c279 Update AUTHORS
• db3f6e6 Merge pull request #342 from Mogost/fix-341
• e069ddb Fix #341
• Additional commits viewable in compare view

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