Update django-filter to 1.0.4

[pyup-bot]

There's a new version of django-filter available.
You are currently using 1.0.1. I have updated it to 1.0.4

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.0.4

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Quick fix for verbose_field_name issue from 1.0.3 (722)

1.0.3

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Improves compatibility with Django REST Framework schema generation.

See the 1.0.3 Milestone__ for full details.

__ https://github.com/carltongibson/django-filter/milestone/13?closed=1

1.0.2

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Updates for compatibility with Django 1.11 and Django REST Framework 3.6.

Adds CI testing against Python 3.6

See the 1.0.2 Milestone__ for full details.

__ https://github.com/carltongibson/django-filter/milestone/12?closed=1

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[pyup-bot]

Closing this in favor of #177