ci(Travis): add tests for Node v9

nodkz · nodkz · commit 6ab1612cdd20 · 2018-01-13T11:58:39.000+06:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,6 +8,7 @@ cache:
 notifications:
   email: true
 node_js:
+  - "9"
   - "8"
   - "6"
 before_install: yarn global add greenkeeper-lockfile@1
