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TODO list:
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-  Finalise unit testing
-  Improve documentation
-  Add progress bar when duration is known
-  Add support for streams by username (i.e. currently live)
-  Websites to add:

   -  facebook.com (in progress)
   -  vimeo.com
   -  dlive.tv
   -  instagib.tv
   -  dailymotion.com
   -  reddit live
   -  younow.com

-  Add ``--statistics`` tag. This will show a summary of all chat
   messages retrieved (e.g. sum YouTube superchat, memberships,
   subscriptions, etc.)
