Updating readme instructions

Author: acolchado

README.md

@@ -147,12 +147,9 @@ To run the test suite, first install the dependancies, then run `npm test`
 
 ```bash
 $ npm install
-$ npm run build
 $ npm test
 ```
 
-> Requires Node 4+ for dev tools, but we recommend using Node 6.
-
 # License
 
 [MIT](LICENSE)