Merge pull request #16 from facebook/lts

ensure testing on node lts

Author: leebyron

.travis.yml

@@ -1,7 +1,8 @@
 language: node_js
 
 node_js:
-  - "stable"
+  - "5"
+  - "4"
   - "iojs"
   - "0.12"
   - "0.10"