Update travis.yml: Add node 6 & 7 (#21)

pzrq · web-flow · commit d62cc06100bd · 2017-03-14T14:31:00.000+11:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 language: node_js
 node_js:
   - 4
+  - 6
+  - 7
 before_install:
   - npm install -g npm@3
   - npm config set loglevel error
