language: node_js

node_js:
  - node
  - "7"
  - "6"

cache:
  directories:
    - node_modules

language: node_js

node_js:
  - node
  - "8"
  - "7"
  - "6"

cache:
  directories:
    - node_modules

Add Node 8 to Travis
chore: Add Node 8 to Travis

Since "node" is now 9.x.