Update minimum node.js version.

Author: slig

.travis.yml

@@ -3,12 +3,9 @@ sudo: false
 language: node_js
 
 node_js:
-  - "0.10"
-  - "0.12"
   - "4"
   - "5"
   - "6"
-  - "iojs"
 
 matrix:
   fast_finish: true

package.json

@@ -8,7 +8,7 @@
   "repository": "javascript-obfuscator/grunt-contrib-obfuscator",
   "license": "MIT",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4"
   },
   "main": "tasks/obfuscator.js",
   "scripts": {