node support in readme

Author: ntwcklng

readme.md

@@ -16,7 +16,7 @@ This package makes creating command line interfaces a breeze.
 
 ## Usage
 
-Install the package (you'll need at least version 4.0.0 of [Node](https://nodejs.org/en/)):
+Install the package (you'll need at least version 6.0.0 of [Node](https://nodejs.org/en/)):
 
 ```bash
 npm install --save args