Bump min (desired) node version to 4

Author: diversario

README.md

@@ -2,7 +2,6 @@
 [![Coverage Status](https://img.shields.io/coveralls/diversario/node-ssdp.svg)](https://coveralls.io/r/diversario/node-ssdp?branch=master)
 [![Dependency Status](https://gemnasium.com/diversario/node-ssdp.png)](https://gemnasium.com/diversario/node-ssdp)
 [![NPM version](https://badge.fury.io/js/node-ssdp.svg)](http://badge.fury.io/js/node-ssdp)
-[![Stories in Ready](https://badge.waffle.io/diversario/node-ssdp.png?label=ready&title=Ready)](https://waffle.io/diversario/node-ssdp)
 
 ## Installation
 

package.json

@@ -28,7 +28,7 @@
   },
   "main": "./index",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4.0.0"
   },
   "devDependencies": {
     "chai": "^4.1.2",