Ffmpeg-progress-yield

* Update python requirements.

* Add a usage option.

* Remove universal_newlines for Windows compat.

* Remove stats_period option for backwards compatibility, fixes 2.

* Format code with black.

* Yield 0 in progress and improve logic.

* Set universal_newlines to true and add kwargs support.

* Increase stats period.

* Document method.

* Add typing.

* Also check for 0 in output.

* Update gitignore.

* Drop python 3.5 support.

* Update badge link.

* Add python_requires to setup.py.