Merge pull request #308 from alphagov/use-node-v6

Change node version from 4 to 6

docs/documentation/install/developer-install-instructions.md

@@ -8,7 +8,7 @@ It's built on the [Express](http://expressjs.com/) framework, and uses these GOV
 
 ## Requirements
 
-node.js - version 4.x.x
+node.js - version 6.x.x
 
 ## Install dependencies
 
@@ -21,4 +21,4 @@ npm install
 npm start
 ```
 
-Go to [localhost:3000](http://localhost:3000) in your browser.
+Go to [localhost:3000](http://localhost:3000) in your browser.

docs/documentation/install/requirements.md

@@ -9,7 +9,7 @@ This guide recommends additional software which will be used in later guides.
 If you have admin access to your machine, you can follow this guide to install the required software.
 
 If you do not have admin access, ask your computer administrator to install:
-* Node.js 4.x.x
+* Node.js 6.x.x
 * Sublime Text 3
 * Command line tools (Mac)
 * Git bash (Windows)
@@ -43,9 +43,9 @@ command to be typed in to terminal
 Once you’ve typed the command, press enter to send it.
 
 
-## Node.js version 4 LTS
+## Node.js version 6 LTS
 
-The kit is designed to work with Node.js version 4 LTS. The kit works with any 4.x.x version.
+The kit is designed to work with Node.js version 6 LTS. The kit works with any 6.x.x version.
 
 ### Check if you have Node.js
 
@@ -55,22 +55,22 @@ node --version
 ```
 If it says `command not found` or `Error 0x2 starting node.exe --version` you don’t have node and will need to download and install it.
 
-If it says `4.3.0` (or other 4.x.x version) you have the correct version installed.
+If the version number starts with 6 you have the correct version installed.
 
-If it says another number such as `0.12` or `5.x.x`, you need to download and install version 4.
+If it says another number such as `0.12` or `5.x.x`, you need to download and install version 6.
 
 ### Download and install Node.js
 
 #### Mac / Windows users
 
-Download version 4 from [nodejs.org](https://nodejs.org/en/).
+Download version 6 from [nodejs.org](https://nodejs.org/en/).
 
 Run the installer with all default options.
 
 #### Linux users
 
 Follow the instructions on the [Node.js](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions
-) site. Make sure you get version 4, not 5.
+) site. Make sure you get version 6, not 7.
 
 ### Once Node is installed
 
@@ -81,7 +81,7 @@ To check it is installed correctly you can again run:
 node --version
 ```
 
-If it’s installed correctly it should say 4.3.0 (or other 4.x.x version)
+If it’s installed correctly it should show a number starting with 6.
 
 ## Sublime Text
 

package.json

@@ -4,7 +4,7 @@
   "version": "4.0.0",
   "private": true,
   "engines": {
-    "node": ">=4.0 <6.7"
+    "node": ">=6.0 <7.0"
   },
   "scripts": {
     "start": "node start.js",