Bump isort from 5.3.2 to 5.4.0 (#153)

Bumps [isort](https://github.com/timothycrosley/isort) from 5.3.2 to 5.4.0.
- [Release notes](https://github.com/timothycrosley/isort/releases)
- [Changelog](https://github.com/timothycrosley/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.3.2...5.4.0)

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