build: support Node.js 9.x

dougwilson · dougwilson · commit 70f3c2bd45df · 2018-01-04T18:55:10.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,6 +11,7 @@ node_js:
   - "6.12"
   - "7.10"
   - "8.9"
+  - "9.3"
 sudo: false
 cache:
   directories:
