Test on more modern versions of nodejs

Drop support for 0.10 and 0.12.

Author: rjmunro

.travis.yml

@@ -1,10 +1,11 @@
 language: node_js
 node_js:
-- "0.10"
-- "0.12"
 - "4"
 - "5"
 - "6"
+- "7"
+- "8"
+- "9"
 sudo: false
 after_success:
 - "npm run coverage"

package.json

@@ -32,7 +32,7 @@
     "prepare-commit-msg"
   ],
   "engines": {
-    "node": ">=0.8.x"
+    "node": ">=4"
   },
   "engine-strict": true,
   "scripts": {