Fixed node.js versions

.travis.yml

@@ -1,6 +1,12 @@
 sudo: false
 language: node_js
 node_js:
-  - "0.10"
+  - "5"
+  - "5.1"
+  - "4"
+  - "4.2"
+  - "4.1"
+  - "4.0"
+  - "0.12"
 before_script:
   - npm install