Update CI for latest node versions.

Author: izaakschroeder

.travis.yml

@@ -2,32 +2,10 @@ sudo: false
 language: node_js
 matrix:
   include:
-    # Run tests in Node.js 0.12
-    - node_js: '0.12'
+    - node_js: 4
+    - node_js: 5
+    - node_js: 6
 
-    # Run tests in Node.js 4.x
-    - node_js: '4'
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - gcc-4.8
-            - g++-4.8
-
-    # Run tests in Node.js 5.x
-    - node_js: '5'
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - gcc-4.8
-            - g++-4.8
-
-before_install:
-  # Use GCC 4.8 if it's available
-  - 'if [ ! `which gcc-4.8` == "" ]; then export CXX=g++-4.8 && export CC=gcc-4.8; fi'
 
 after_script:
   - npm install coveralls