ci(travis): Drop Node 9 (#220)

francoischalifour · web-flow · commit 9ab5aa762446 · 2018-09-03T13:13:22.000+02:00
Speed up the CI checks.
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,6 @@
 language: node_js
 node_js:
   - 8
-  - 9
   - 10
 cache:
   - yarn: true
