Update README.md (#142)
Update README.md (#142)

* Update README.md

Added example of verifying levels

Fixes #141

* shorten example, add link to wiki page

Co-authored-by: Werner Robitza <756f0536f917fb66ee0dfb6b29077c82f9b38ef2@users.noreply.github.com>
slhck/audio-normalize,slhck/ffmpeg-normalize