Missing requirements in readme #453 (#524)

SidHarder · daviddias · commit 3b573932ea7b · 2016-10-18T13:21:28.000+01:00
* Added requirements statement in readme.md

* Adding Tested OS to requirements

* modify requirements section of readme
diff --git a/README.md b/README.md
@@ -60,6 +60,8 @@ This project is available through [npm](https://www.npmjs.com/). To install:
 $ npm install ipfs --save
 ```
 
+Requires npm@3 and node >= 4, tested on OSX & Linux, expected to work on Windows.
+
 ### Use in Node.js
 
 To include this project programmatically:
