add node v8, v9

Joe Hand · web-flow · commit 588d669f5390 · 2017-12-11T16:44:22.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,8 @@ language: node_js
 node_js:
   - '4'
   - '6'
+  - '8'
+  - '9'
 cache:
   directories:
     - node_modules
