language: node_js
node_js:
  - "0.10"
before_install:
  - "sudo apt-get update"
  - "sudo apt-get install graphviz"
language: node_js

node_js:
- 4

before_install:
- sudo apt-get update
- sudo apt-get install graphviz
Update Travis config to use Node 4.
Update Travis config to use Node 4.