Merge pull request #13 from ntwb/patch-1

Travis CI: Test on latest Node.js v4.x.x and v6.x.x branches

Author: gajus

.travis.yml

@@ -1,7 +1,8 @@
 language: node_js
 node_js:
-    - '5.0'
-    - '4.0'
+    - '6'
+    - '5'
+    - '4'
 notifications:
     email: false
 sudo: false