Update version to 4.0.0 (MIT-LCP#398)

* Add more metadata fields to project metadata

* Add upload instructions to README

Merge pull request MIT-LCP#321 from hofaflo/no-sklearn

Remove dependency on scikit-learn

Update version to 3.4.0

Updates version

Bumps version for new release

Updates version

Merge pull request MIT-LCP#270 from MIT-LCP/edf_header

Adds optional EDF header reader

Updates version

Merge pull request MIT-LCP#246 from MIT-LCP/mit2wav

Produces WAV file from WFDB format

Updates requirements.txt

Updates requirements.txt to specify the development environment by using exact package versions.