Update python-decouple to 3.8

[pyup-bot]

This PR updates python-decouple from 3.5 to 3.8.

Changelog

3.8

What's Changed
* Raise KeyError when key is not found in ini repositories by b0o in https://github.com/HBNetwork/python-decouple/pull/153
* Fix infinite recursion on Windows by ibachar-es in https://github.com/HBNetwork/python-decouple/pull/137

New Contributors
* b0o made their first contribution in https://github.com/HBNetwork/python-decouple/pull/153
* ibachar-es made their first contribution in https://github.com/HBNetwork/python-decouple/pull/137

**Full Changelog**: https://github.com/HBNetwork/python-decouple/compare/v3.7...v3.8

3.7

What's Changed
* Fix `Csv` cast hanging with `default=None`, now returning an empty list. (149)

New Contributors
* iurisilvio  made their first contribution in https://github.com/henriquebastos/python-decouple/pull/149

**Full Changelog**: https://github.com/henriquebastos/python-decouple/compare/v3.6...v3.7

3.6

What's Changed
* Update Changelog to reflect latest versions by stevejalim in https://github.com/henriquebastos/python-decouple/pull/129
* fix: replace strtobool for local function by ZandorSabino in https://github.com/henriquebastos/python-decouple/pull/128

New Contributors
* stevejalim made their first contribution in https://github.com/henriquebastos/python-decouple/pull/129
* ZandorSabino made their first contribution in https://github.com/henriquebastos/python-decouple/pull/128

**Full Changelog**: https://github.com/henriquebastos/python-decouple/compare/v3.5...v3.6

Links

• PyPI: https://pypi.org/project/python-decouple
• Changelog: https://pyup.io/changelogs/python-decouple/
• Repo: http://github.com/henriquebastos/python-decouple/

[codecov-commenter]

Codecov Report

Merging #337 (a242ecf) into master (e9da4aa) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #337   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          30       30           
  Lines         868      868           
=======================================
  Hits          863      863           
  Misses          5        5           

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