Log Message:
py-isort: updated to 4.3.0

4.3.0:
- Fixed 557: force_alphabetical_sort and force_sort_within_sections can now be \ 
utilized together without extra new lines
- Fix case-sensitive path existence check in Mac OS X
- Added --no-lines-before for more granular control over section output
- Fixed 493: Unwanted conversion to Windows line endings
- Implemented --version-number to retrieve just the version number without the \ 
isort logo
- Breaking changes
    - Python 2.7+ only (dropped 2.6) allowing various code simplifications and \ 
improvements.