Add Node.js 8 to Travis CI test matrix (#144)

ChristianMurphy · sindresorhus · commit eab89241aa55 · 2017-06-13T00:18:26.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 sudo: false
 language: node_js
 node_js:
+  - '8'
   - '6'
   - '4'
