Chaining .on call breaks with vjs v6

[clintonbosch]

The chained player.on 'mouseover' and 'mouseout' call breaks for some reason when using this plugin with v6 of videojs. Chainging to this fixes the problem:

    player.on('mouseover', function() {
      // on hover, fade in the social share tools
      _ss.classList.add('is-visible');
    });
    player.on('mouseout', function() {
      // when not hovering, fade share tools back out
      _ss.classList.remove('is-visible');
    });

Pull request to follow

[jmccraw]

Thanks. Fixed in another pull request.