Merge pull request #213 from mbaumgartl/fix-travis-build

Fix travis build

Author: johnjbarton

.travis.yml

@@ -4,12 +4,13 @@ node_js:
   - 8
   - 10
 
+services:
+  - xvfb
+
 before_install:
   - npm install -g npm
 
 before_script:
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
   - npm install -g grunt-cli
 
 script: