Drop support for EOL versions

See https://github.com/nodejs/Release

Author: mckramer

.travis.yml

@@ -1,11 +1,10 @@
 language: node_js
 
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4.0"
-  - "4.1"
-  - iojs
+  - "4"
+  - "6"
+  - "8"
+  - "9"
 
 after_success: npm run coveralls
 

package.json

@@ -83,5 +83,8 @@
     "nyc": ">=2.2.1",
     "zap": ">=0.2.9"
   },
+  "engines" : {
+    "node" : ">=4.0.0"
+  },
   "license": "MIT"
 }