Updates version requirement info.

diff --git a/README.md b/README.md
index 1706a91..6a787be 100644 (file)
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ According to [tests](http://goalsmashers.github.io/css-minification-benchmark/)
 ### What are the requirements?
 
 ```
-Node.js 0.10+ (tested on CentOS, Ubuntu, OS X 10.6+, and Windows 7+) or io.js 3.0+
+Node.js 4.0+ (tested on CentOS, Ubuntu, OS X, and Windows)
 ```
 
 ### How to install clean-css?