chore: bump travis nodejs version to 8 (#9198)

jelbourn · jelbourn · commit 57449eb37422 · 2018-01-09T12:01:33.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ sudo: false
 dist: trusty
 
 node_js:
-  - '7'
+  - '8'
 
 addons:
   jwt:
