Saves the songs the users queue in the backup list. #47
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One requested feature on the server I'm using this bot on
(TKbreezy/ConeyZZ subscriber Discord) was that the bot play music that
was previously requested when there's nothing on the queue. This
accomplishes that by writing to the backup list when a user !plays a
song and erasing it from the backup list when that song is !skipped.
This seems to work, even though the bot complains that "the file is
locked" whenever a skip occurs.