ci: only build on node 9

bartlangelaan · web-flow · commit d02def8d4a1a · 2018-04-26T11:07:05.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,5 @@
 language: node_js
-node_js:
-  - 9
-  - 8
+node_js: 9
 
 notifications:
   email: false
