readme update

README.md

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 Requires a browser with support for CSS 3D transforms, such as Chrome or Safari. 
 
 Curious about how this looks in action? [Check out the demo page.](http://hakim.se/experiments/css/slideshow/).
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+# License
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+MIT licensed
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+Copyright (C) 2011 Hakim El Hattab, http://hakim.se