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On Python 3, `open is io.open`.

Ignore warnings related to Python 2, because it's going away soon.

This is the result of:

    $ isort --recursive examples templates transformers utils hubconf.py setup.py

This is the result of:

    $ black --line-length 119 examples templates transformers utils hubconf.py setup.py

There's a lot of fairly long lines in the project. As a consequence, I'm
picking the longest widely accepted line length, 119 characters.

This is also Thomas' preference, because it allows for explicit variable
names, to make the code easier to understand.

Co-Authored-By: Lysandre Debut <lysandre.debut@reseau.eseo.fr>