Fix requirements.txt: sklearn -> scikit-learn

Bump version to 1.0.1

Remove Travis

Add notes about manually installing sndfile and install it on CI

Remove 'nose'

Install FFMpeg via third-party action

Remove Python 2 from CI

Install FFMpeg on CI

Check that FFMpeg is installed on CI

Fix deprecated np.int -> int, np.bool -> bool

Change deprecated package name sklearn scikit-learn

Add Github actions

Update .gitignore

Better Python API example: Batch syncrhonize files in a folder (fixes #10)

Remove OSX builds from Travis (not stable)