Bump isort from 4.3.12 to 4.3.13
Bump isort from 4.3.12 to 4.3.13

Bumps [isort](https://github.com/timothycrosley/isort) from 4.3.12 to 4.3.13.
- [Release notes](https://github.com/timothycrosley/isort/releases)
- [Changelog](https://github.com/timothycrosley/isort/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/timothycrosley/isort/compare/4.3.12...4.3.13)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
plus3it/watchmaker,plus3it/watchmaker