Add `ytdl_skip_on_fail` option
Add `ytdl_skip_on_fail` option

By default, `ytdlrc` uses playlist titles as directory names to organize
downloaded videos. Sometimes `youtube-dl` fails to pull the playlist
title. If this happens users are left with two options:

1. Use "unknown-playlist" as the directory name and download any missing
   videos. This has the potential to be a bit annoying because downloaded
   videos can become disorganized over time.

2. Skip the playlist for now and move on to the next item in the
   `snatch.list`

Old default behavior was the 1st option. New default behavior is the 2nd
option. The script will attempt to pull the value twice before moving
on.

bardisty/ytdlrc