move to trusty (#291)

avoids need for sudo

.travis.yml

@@ -1,14 +1,10 @@
 language: node_js
-sudo: required
+sudo: false
+dist: trusty
 
 node_js:
   - '6.9.4'
 
-before_install:
-  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-  - sudo apt-get update -q
-  - sudo apt-get install g++-4.8 -y
-
 install:
   - npm install -g npm@3.10.7
   - npm install
@@ -25,9 +21,6 @@ cache:
   directories:
     - node_modules
 
-env:
-  - CXX=g++-4.8
-
 addons:
   apt:
     packages: