Followers
Follow Playlist
playlists.followers.follow(strplaylist_id, FollowerFollowParams**kwargs)
PUT/playlists/{playlist_id}/followers
Unfollow Playlist
playlists.followers.unfollow(strplaylist_id)
DELETE/playlists/{playlist_id}/followers
Check if Current User Follows Playlist
playlists.followers.check(strplaylist_id, FollowerCheckParams**kwargs) -> FollowerCheckResponse
GET/playlists/{playlist_id}/followers/contains