Update django-haystack requirement from <2.2,>=2.1.0 to >=2.1.0,<2.9

[dependabot-preview[bot]]

Updates the requirements on django-haystack to permit the latest version.

Changelog

Sourced from django-haystack's changelog.

v2.8.1 (2018-03-16)

• Merge pull request #1596 from klass-ivan/collecting-deep-attr-through-m2m. [Chris Adams]

  Fixed collection of deep attributes through m2m relation

• Fixed collection of deep attributes through m2m relation. [Ivan Klass]

v2.8.0 (2018-03-09)

• Optimize ElasticSearch backend (closes #1590) [Chris Adams]

  Thanks to @​klass-ivan for the patch

• [elasticsearch backend] - Fixed index re-obtaining for every field. [Ivan Klass]

• Django 2.0 compatibility (closes #1582) [Chris Adams]

  Thanks to @​mpauly and @​timgraham for working on this and @​dani0805, @​andrewbenedictwallace, @​rabidcicada, @​webtweakers, @​nadimtuhin, and @​JonLevischi for testing.

• Implemented TG's review comments. [Martin Pauly]

• Drop support for old django versions. [Martin Pauly]

• For some reason the mock needs to return something. [Martin Pauly]

• Django 2.0 changes to tests. [Martin Pauly]

• Dropped a few unnecessary interactive=False. [Martin Pauly]

• Replace get_coords() by coords in more places. [Martin Pauly]

• Ignore python2 Django2 combination. [Martin Pauly]

• Drop tests for Django < 1.11. [Martin Pauly]

• Update requirements in setup.py. [Martin Pauly]

• Update imports to drop Django 1.8 support. [Martin Pauly]

• Fix intendation error in tox.ini. [Martin Pauly]

• Merge https://github.com/django-haystack/django-haystack. [Martin Pauly]

• Added a test for exclusion of M2M fields for ModelSearchIndex. [Martin Pauly]

• In Django 2.0 ForeinKeys must have on_delete. [Martin Pauly]

• Assuming that everyone who wants to run these tests upgrades pysolr. [Martin Pauly]

• Django 2.0 is not compatible with python 2.7. [Martin Pauly]

• Deal with tuples and strings. [Martin Pauly]

• Fix a bug due to string __version__ of pysolr. [Martin Pauly]

• Fix tox. [Martin Pauly]

• Mocking order. [Martin Pauly]

• Reverse order. [Martin Pauly]

• Update test - the interactive kwarg is only passed to the clear_index command. [Martin Pauly]

• Revert "Trigger travis build" [Martin Pauly]

  This reverts commit 7a9ac3824d7c6d5a9de63e4144ccb8c78daf60d6.

• Trigger travis build. [Martin Pauly]

• Update authors. [Martin Pauly]

• Update tests. [Martin Pauly]

• Update imports. [Martin Pauly]

• Fix missing attribute rel. [Martin Pauly]

• Add the corresponding option for update_index. [Martin Pauly]

• Fix import order. [Martin Pauly]

... (truncated)

Commits

• 1f01077 Merge pull request #1596 from klass-ivan/collecting-deep-attr-through-m2m
• fc94f42 Fixed collection of deep attributes through m2m relation
• 7adc1a4 Optimize ElasticSearch backend (closes #1590)
• 514023e Django 2.0 compatibility (closes #1582)
• 4b7681c Merge pull request #1576 from claudep/pep479
• e25d605 [elasticsearch backend] - Fixed index re-obtaining for every field
• 40cbee5 Implemented TG's review comments
• 12c75a2 drop support for old django versions
• 0cb4d84 For some reason the mock needs to return something
• eb82ab1 Django 2.0 changes to tests
• Additional commits viewable in compare view

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