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: ZOqj2XVNVwfT74rHxg/ljcAsS6FnmDpRSsXbsy1Icv9DcLHrMlmyQ10gWBjE/YXYF0Uv4akQ1qqn0TJaKOtp9HZeH+P6OPAYk2vJbWD7qp52pPtIqEFomcsUyflt4IjfaXKuN4FMod7PSWVSGJ+DxSguJvZKILkrs5d/rJdFv3c=
     - secure: clkqemGQG16TXyAPkv9LBv6x3SbT3ZM0eo8LETx4uNKi3WzlwgXxZA9b5Sr5wYzxyxFFpnhDXW7CL4+UjYu1atGNeTW2TuSaYUPHtgu67OFDr8Jbw047p1XQb5enPSt9+YxrHKfjHBiJvWulJ8rCSQshU9Rhe0DC6NrFRPFgk0A=
-    - 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