Ffmpeg-normalize

* Bump requirements, should fix 155.

* Move all examples to Wiki.

* Update badge link.

* Add python_requires to setup.py.

* Improve README.

* Add GitHub actions badge.

* Add GitHub actions tests.

* Properly convert EBU JSON values to float.

* Switch to f strings, remove Python 3.5 support.

* Format code with black.

* Fix flake8 errors.

* Factor out method.

* WIP: new tests.

* Log to stderr by default to enable JSON parsing.

* Remove release script.

* Format setup.py.

* Switch progress to external lib.

* Remove support for older versions.

* Adjusted handling of FFMPEG_PATH for binaries available via $PATH (149)

* adjusted handling of FFMPEG_PATH for binaries available via $PATH

fixes 147

* adjusted use of %s to {} to match style

* documented the feature

* condensed error message as other lines are longer

* Fix JSON output for multiple files.

* Update badge URL.

* Update README.md (142)

* Update README.md

Added example of verifying levels

Fixes 141

* shorten example, add link to wiki page

* Error if no ffmpeg exec exists.

* Add stalebot.