Remove node 4 and add latest node

mesaugat · mesaugat · commit 5b92bcf0313f · 2018-08-25T20:12:11.000+05:45
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,7 @@
 language: node_js
 node_js:
+  - node
   - '8'
-  - '7'
   - '6'
-  - '4'
 
 cache: yarn
