chore: update travis

juanpicado · juanpicado · commit 4fbe26bee350 · 2018-04-16T21:49:39.000+02:00
remove node 4 and 5 are already deprecated
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - 'node'
+  - '9'
+  - '8'
   - '6'
-  - '5'
-  - '4'
