Fix the README to have correct links.
Fix the README to have correct links.

Make sure we are using youtube/spitfire and not spt/spitfire.

nicksay/spitfire,nicksay/spitfire,nicksay/spitfire,spt/spitfire,youtube/spitfire,youtube/spitfire,spt/spitfire,spt/spitfire,spt/spitfire,youtube/spitfire,youtube/spitfire,nicksay/spitfire