Only run in node >= 4

Author: hjdivad

.travis.yml

@@ -1,14 +1,15 @@
 language: node_js
+node_js:
+  - "4"
+  - "6"
+  - "8"
+  - "9"
+
 sudo: false
 cache:
   directories:
     - node_modules
 
-env:
-  - NODE_VERSION=0.10
-  - NODE_VERSION=0.12
-  - NODE_VERSION=iojs
-
 branches:
   only:
     - master

package.json

@@ -27,5 +27,8 @@
   "devDependencies": {
     "mocha": "^1.21.4",
     "mocha-jshint": "^1.1.0"
+  },
+  "engines": {
+    "node": ">= 4.0"
   }
 }