Update links to unpkg CDN so it works from china
Update links to unpkg CDN so it works from china

play-with-docker/play-with-docker,franela/play-with-docker,franela/play-with-docker,franela/play-with-docker,play-with-docker/play-with-docker,play-with-docker/play-with-docker,play-with-docker/play-with-docker,franela/play-with-docker