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: AsXK1s4viLG4eumYMxE0bJasVbWrpQ7JaUboMoK4Nzhmunx01udikRRAJifl3nkcc4m2GpzCb4Kmtyh5hxyLA05uE416VzmfDq3dGJKsNAQXbSescSVik63llq4HXAdOvek2eSo5wOVGNHslscIed5K2bJajXfPMIODJyBxo8aE=
     - secure: V/H/0+/R8owujbwe3IDbND8v5zs4pWTe0hRCLefjgR9ci2lmNNP54Zb97nOZnLQqynafDSyrngL3+RP5F0fk1dC++cpuxQNKoYPwDFPZ41LAxp5dgtyxkb+J4eWtq0UilWF5thVt4oB1OWwPGtxMmSl+imXXKtq4a4Ov++t2Apo=
-    - 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