Bump isort from 5.5.0 to 5.5.1 (#166)

Bumps [isort](https://github.com/pycqa/isort) from 5.5.0 to 5.5.1.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.5.0...5.5.1)

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

pyproject.toml

@@ -26,7 +26,7 @@ requests-mock = "^1.8.0"
 docutils = "^0.16"
 pytest = "^6.0.0"
 black = {version = "^20.8b1", allow-prereleases = true}
-isort = {version = "^5.5.0", allow-prereleases = true}
+isort = {version = "^5.5.1", allow-prereleases = true}
 flake8 = "^3.8.3"
 mypy = "^0.782"