Update .travis.yml

cheton · cheton · commit c74ac1ce77f5 · 2018-05-19T22:17:33.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,9 +8,8 @@ os:
   - linux
 
 node_js:
+  - '8'
   - '6'
-  - '5'
-  - '4'
 
 before_install:
   - npm install -g npm
