Log Message:
py-isort: updated to 4.3.18

4.3.18:
- Fixed an issue with parsing files that contain unicode characters in Python 2
- Fixed issue 924 - Pulling in pip internals causes depreciation warning
- Fixed issue 938 - Providing a way to filter explicitly passed in files via \ 
configuration settings (`--filter-files`)
- Improved interoperability with toml configuration files