- Switch to multibuild to avoid cycle with pylama

- Drop add-editorconfig.patch made redundant by new sdist
- Add fdupes
- Update to v4.3.9
* Fixed a bug that led to an incompatibility with black: #831
- from 4.3.8
* Fixed a bug that led to the recursive option not always been available
from the command line.
- from 4.3.7
* Expands the finder failsafe to occur on the creation of the finder objects.
- from 4.3.6
* Fixes a fatal error that occurs if a single finder throws an exception.
Important as we add more finders that utilize third party libraries.
- from 4.3.5
+ Potentially Interface Breaking:
* The `-r` option for removing imports has been renamed `-rm` to avoid
accidental deletions and confusion with the `-rc` recursive option.
* `__init__.py` has been removed from the default ignore list. The default
ignore list is now empty - with all items needing to be explicitly ignored.
* Isort will now by default ignore .tox / venv folders in an effort to be "safe".
You can disable this behaviour by setting the "--unsafe" flag, this is
separate from any skip or not skip rules you may have in place.
* Isort now allows for files missing closing newlines in whitespace check
* `distutils` support has been removed to simplify setup.py
+ New:
* Official Python 3.7 Compatibility.
* Support for using requirements files to auto determine third-paty
section if pipreqs & requirementslib are installed.
* Added support for using pyproject.toml if toml is installed.