Updated node version requirement in README.md

Author: jimfb

README.md

@@ -60,7 +60,7 @@ The process to build `react.js` is built entirely on top of node.js, using many
 
 #### Prerequisites
 
-* You have `node` installed at v0.10.0+ (it might work at lower versions, we just haven't tested) and `npm` at v2.0.0+.
+* You have `node` installed at v4.0.0+ and `npm` at v2.0.0+.
 * You are familiar with `npm` and know whether or not you need to use `sudo` when installing packages globally.
 * You are familiar with `git`.