travis: only test on node 8

Rowno · Rowno · commit e75277a670c8 · 2018-01-17T09:17:22.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,5 @@
 language: node_js
 node_js:
-  - "6"
-  - "7"
   - "8"
 cache:
   yarn: true
