chore: bump node requirements in the README

Author: Foxandxss

README.md

@@ -24,7 +24,7 @@ Learn how to [contribute to Angular.io](https://github.com/angular/angular.js/bl
 ## Development Setup
 This site relies heavily on node and npm.
 
-1. Make sure you are using the latest node and npm; 
+1. Make sure you are using at least node v.5+ and latest npm; 
 if not install [nvm](https://github.com/creationix/nvm) to get node going on your machine.
 
 1. install these npm packages *globally*: `npm install -g harp gulp`
@@ -35,7 +35,7 @@ The two cloned repo directories must be sibling.
 1. cd into root directory `angular.io/`
 
 1. install the *all-docs* local packages by running `npm install`
-> If running node v.5+, you probably must rebuild `node-sass` in a separate step: `npm rebuild node-sass`
+> You probably must rebuild `node-sass` in a separate step: `npm rebuild node-sass`
 
 1. See [below](#code-sample-development) for code sample development preparation.