Can't download Images-Preview with YoutubeEmbed.py

[WuglyakBolgoink]

Hi,

YoutubeEmbed.py has a problem

1. regex allow ONLY HTTP-URL, but MUST HTTPS
2. image download (_add_play_button-function) doesn't work on macOS (with installed request module) maybe I need another module, don't know..

youtube_url_re = re.compile('^!VIDEO\s+"https://www\.youtube\.com'
                            '/embed/([a-zA-Z0-9\-]*)"')

image_url = 'https://img.youtube.com/vi/%s/0.jpg' % url
video_url = 'https://www.youtube.com/watch?v=%s' % url

[amyreese]

Can you try with the youtube-embed branch from #39 and see if that solves your issue?