Update python-slugify to 3.0.1

[pyup-bot]

This PR updates python-slugify from 1.2.6 to 3.0.1.

Changelog

3.0.1

- Add test.py to manifest

3.0.0

- Upgrade Unidecode
- Promote text-unidecode as the primary decoding package
- Add Unidecode as an optional extra. "pip install python-slugify[unidecode]"

2.0.1

- Add replacements option e.g. [['|', 'or'], ['%', 'percent'], ['-', '_']] (andriyor)

2.0.0

- Fix alternative dependency installation

Links

• PyPI: https://pypi.org/project/python-slugify
• Changelog: https://pyup.io/changelogs/python-slugify/
• Repo: https://github.com/un33k/python-slugify

[coveralls]

Pull Request Test Coverage Report for Build 776

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.739%

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Totals
Change from base Build 773:	0.0%
Covered Lines:	1649
Relevant Lines:	2267

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #181