Updated project description.

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 ## What is clean-css? ##
 
-Clean-css is a node.js library for minifying CSS files. It does the same job as YUI Compressor's CSS minifier but much faster thanks to speed of node.js V8 engine.
+Clean-css is a node.js library for minifying CSS files. It does the same job as YUI Compressor's CSS minifier but much faster thanks to many speed optimizations and the node.js itself.
 
 ## Usage ##