build: support Node.js 9.x

dougwilson · dougwilson · commit 70e9903d5515 · 2018-01-15T12:41:47.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,6 +11,7 @@ node_js:
   - "6.12"
   - "7.10"
   - "8.9"
+  - "9.4"
 sudo: false
 cache:
   directories:
