try removing comments in travis.yml

.travis.yml

@@ -11,13 +11,6 @@ addons:
 cache:
   yarn: true
 
-# before_script:
-#   - "sudo chown root /opt/google/chrome/chrome-sandbox"
-#   - "sudo chmod 4755 /opt/google/chrome/chrome-sandbox"
-#   - "export DISPLAY=:99.0"
-#   - "sh -e /etc/init.d/xvfb start"
-#   - sleep 3 # give xvfb some time to start
-
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH