💚 Update CI config

Author: gluons

.travis.yml

@@ -1,3 +1,6 @@
+dist: xenial
+services:
+  - xvfb
 language: node_js
 node_js:
   - "node"
@@ -6,9 +9,6 @@ node_js:
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH="$HOME/.yarn/bin:$PATH"
-before_script:
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
 addons:
   firefox: "latest"
 cache: yarn