Bump isort from 5.5.3 to 5.5.4 (#85)

Bumps [isort](https://github.com/pycqa/isort) from 5.5.3 to 5.5.4.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.5.3...5.5.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -12,7 +12,7 @@ pip-tools==5.3.1
 # Lint
 black==20.8b1
 flake8==3.8.3
-isort==5.5.3
+isort==5.5.4
 mypy==0.782
 
 # Security