language: node_js
node_js:
- '4'
cache:
  directories:
  - node_modules
notifications:
  email: false
  slack:
    rooms:
      - SLACK_SECURE
language: node_js
node_js:
- '4'
cache:
  directories:
  - node_modules
notifications:
  email: false
  slack:
    rooms:
      - $SLACK_SECURE

Add $ to environment variables
Add $ to environment variables