Bump isort from 4.3.18 to 4.3.19
Bump isort from 4.3.18 to 4.3.19

Bumps [isort](https://github.com/timothycrosley/isort) from 4.3.18 to 4.3.19.
- [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/4.3.18...4.3.19)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sedders123/phial