fix: require sudo

Author: timblack1

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
-sudo: false
+sudo: required
 notifications:
   email: false
 cache:
@@ -9,7 +9,7 @@ before_script:
   - npm install -g bower polylint web-component-tester
   - bower install
   - polylint
-  - apt-get install -y libappindicator1 fonts-liberation
+  - sudo apt-get install -y libappindicator1 fonts-liberation
   - wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
   - sudo dpkg -i google-chrome*.deb
 env: