updated travis env

Alexey Litvinov · Alexey Litvinov · commit 10ae9705382b · 2017-03-31T00:21:04.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,8 @@
 sudo: false
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "iojs"
+  - "4"
+  - "6"
 script: npm run travis
 
 before_install:
