Update travis config

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
-sudo: false
+sudo: required
 before_script:
   - npm install -g bower polylint web-component-tester
   - bower install
@@ -8,18 +8,16 @@ env:
   global:
     - secure: ltCkwJM0nkTS9WjikyjqBsB5J2hQon4UnVVrINk4y+Vq4v9PQJH3+83nya0jnxilKaeAJs4d2/OS02F9GkqYpsSmDz7OgXPfk0hrHA8UksvvpSALfnukleIAN2YTOcxXJKeNHcfpqCKPk1dGeNQOEM61H+QgTBIyFB3sMugygqs=
     - secure: TJuu1WdpFLTaBN/prBafm8Pld/BQCySNuuG1nATbF3fqiOpgehXu8Z5URAz5syUhqZAyEmuRMxvXpEVD/t1jrtaXVwkdCFkkQ4ckkP4gTIeSGA/Puw8sveB2q7QAqXyTmeFkocNlh8fxV+B07o0SPWdhcvdZnDVU9VrpSqL+92M=
-    - CXX=g++-4.8
 node_js: stable
 addons:
   firefox: latest
   apt:
     sources:
       - google-chrome
-      - ubuntu-toolchain-r-test
     packages:
       - google-chrome-stable
-      - g++-4.8
   sauce_connect: true
 script:
   - xvfb-run wct
   - "if [ \"${TRAVIS_PULL_REQUEST}\" = \"false\" ]; then wct -s 'default'; fi"
+dist: trusty