function setPlaylistVisualization(playlist, visualizationKey) {
    if (_config2.default.playlists[playlist] != undefined) {
      if (_config2.default.visualizations.available[visualizationKey] != undefined) {
        _config2.default.playlists[playlist].visualization = visualizationKey;
      } else {
        _debug2.default.writeMessage("A visualization does not exist for the key provided.");
      }
    } else {
      _debug2.default.writeMessage("The playlist for the key provided does not exist");
    }
  }
Set the visualization for the playlist

@param {string} playlist - The playlist we are setting the visualization for.
@param {string} visualizationKey - The key of the visualization we are adding to the playlist.