Add node@6 to .travis.yml.

Robert Jackson · Robert Jackson · commit 7c9fab790b9c · 2017-02-02T11:05:05.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: node_js
 node_js:
   - "stable"
   - "4"
+  - "6"
 
 env:
   - CXX=g++-4.8 WORKER_COUNT=2
