now.json

{
  "name": "probot-empty",
  "alias": "probot-empty.now.sh",
  "env": {
    "NODE_ENV": "production",
    "APP_ID": "@probot-app-id",
    "WEBHOOK_SECRET": "@probot-webhook-secret",
    "PRIVATE_KEY_BASE64": "@probot-private-key-base64"
  }
}