Method to validate playlists by URL

[blrbrb]

This is a very very low priority suggjestion but,

Adding a method that extracts and validates the ID of a playlist straight from a link would make the process a little bit more convientent in the longrun. This has been a really useful tool otherwise, thank you! :)

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.