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: YrC5bTrJwlszZQWfnRwDbLaZNLf+KnWXTAfzvul7eij21W3/v+E0wp9pFTLQj/G3bZWgOEZSsoXxASNcNu1JUmJRyLXpJgTps25IlS/VJTRHoK7jUjt5pJG1CbcgTixQblyOVtPqT6j0V23V0d3mhQ3H2xFBbcl87iYO1w+6nmQ=
     - secure: NZv74uwtibMbmarEOWRUNkEwjz/2akWEIe2JDxglag2JUECWrcAKJIQUqYsO0KNUIg09xJEqWLWED4fN73p3z27Jl/z99ssVMvPQt8duoxwZ6UwcjVWUQNjgXKN6JDZCf+3hJsmU51Lp6mpzj0Y5m8nCjhh7/bBnJahH+VRm7bA=
-    - 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