Update node versions.

jonkemp · jonkemp · commit 137f5538e423 · 2018-10-23T21:54:09.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,9 @@
 sudo: false
 language: node_js
 node_js:
+  - '10'
   - '8'
   - '6'
-  - '4'
 before_script:
   - npm install -g gulp
   - gulp lint
