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: wz9Lv8ap0neme5w4cfbn8pXZoderSVb6hHd7tSCnO7JE94P06Qoh8tqMAd2enXkY3fHxBVVy75dKqOAEFai+HX7Heazl/id7PkTrImnOIXmdC1RX8AJTAuXgFO1RtIoBA8RgCiQzuwvwHL+mp08G6gG12cjYBYdofWcWc4OeUYc=
     - secure: tHmA3RiboWGxMD7esoy/E600eoECK7RDysv0cFqcb2JD5E7Lv7iriqsRszEQa/VElbSxY6RdC505XmBmSpANi3TMVt7OYGzfRpqrh3ARzWMS+s3sz/bRFp6drsBMqTQ+Pl65EVBged7gK3aiwUFWI8dZsMocV+L3y5157sNMyOg=
-    - 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:
   - 'true || xvfb-run wct'
   - "if [ \"${TRAVIS_PULL_REQUEST}\" = \"false\" ]; then true || wct -s 'default'; fi"
+dist: trusty