Bump python-decouple from 3.6 to 3.8 (#50)

Bumps [python-decouple](https://github.com/henriquebastos/python-decouple) from 3.6 to 3.8.
- [Release notes](https://github.com/henriquebastos/python-decouple/releases)
- [Changelog](https://github.com/HBNetwork/python-decouple/blob/master/CHANGELOG.md)
- [Commits](HBNetwork/python-decouple@v3.6...v3.8)

---
updated-dependencies:
- dependency-name: python-decouple
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Vishal <vi6hal@gmail.com>

Author: dependabot[bot]

{{cookiecutter.project_slug}}/requirements.txt

@@ -8,5 +8,5 @@ dj-database-url==1.2.0
 drf-yasg==1.21.4
 gunicorn==20.1.0
 psycopg2-binary==2.9.5
-python-decouple==3.6
+python-decouple==3.8
 whitenoise==6.2.0