modernize travis nodejs versions, was testing ancient reality

Author: Paul Devine

.travis.yml

@@ -4,9 +4,10 @@ notifications:
     - [email protected]
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "iojs"
-  - "4.0"
+  - "7"
+  - "6.6"
+  - "6"
+  - "5"
+  - "4"
 services:
   - redis-server