Added mention of 'rickrollYoutube' cipher - Shortened URLs pointing t…

…o Youtube videos of Rick Astley performances & covers

Added mention of 'rickrollYoutube' cipher - Shortened URLs pointing to Youtube videos of Rick Astley performances & covers

Fixed nasty bug in Decloakify code, please re-baseline

Fixed nasty bug in call to Decloakify(), please re-baseline.

Update README.md

Updated screenshot