Bumps [isort](https://github.com/timothycrosley/isort) from 4.3.4 to 4.3.8.
- [Release notes](https://github.com/timothycrosley/isort/releases)
- [Changelog](https://github.com/timothycrosley/isort/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/timothycrosley/isort/commits

)

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