Fix travis configuration

pronebird · pronebird · commit b895d544e693 · 2019-08-31T16:19:38.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,9 +4,9 @@ language: node_js
 
 node_js:
   - '10'
-
-before_script:
-  - export DISPLAY=:99.0; sh -e /etc/init.d/xvfb start
+cache: npm
+services:
+  - xvfb
 
 install:
   - npm install
