chore: changed xvfb to a service.

diasbruno · diasbruno · commit 4dd25acdc34c · 2019-08-27T11:05:15.000-03:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: node_js
 node_js:
   - "8"
 cache: yarn
-service:
+services:
   - xvfb
 before_script:
   - export DISPLAY=:99.0
