Update travis node versions

lukemelia · lukemelia · commit ceca4e342d30 · 2020-05-16T15:45:51.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,7 @@
 language: node_js
 node_js:
-  - '4'
-  - '6'
-  - '8'
   - '10'
+  - '12'
 sudo: false
 cache:
   yarn: true
