yt_get_key() and yt_set_key(), and
a new auth argument to the internal function
tuber_GET(). Users can now pass auth = "key"
to any function that uses tuber_GET() to enable API key
authentication. The behavior of tuber_GET() remains
unchanged when using the new default, auth = "token", which
avoids breaking changes to previously written code (@gvelasq, #117).fixes list_channel_videos. it used to iterate over all the playlists. You don’t need to do that. All the uploaded videos of a channel are available in a playlist with the same id as channel id except the first two letters are switched.
fixes get_playlist_items. thanks to @TebanSierra. See #39.