Run Travis on nodejs 0.12 and on io.js
diff --git a/.travis.yml b/.travis.yml
index de4b73b..7de7b97 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@
   - "0.8"
   - "0.10"
   - "0.11"
+  - "0.12"
+  - "iojs"
 services:
   - couchdb
 os: