message: Fix Node.js 6 support
diff: @@ -361,11 +361,15 @@ class BaseServer {
  .then(() => Promise.all(before))
  .then(keys => new Promise((resolve, reject) => {
  if (keys[0] && keys[0].pem) {
  - this.http = https.createServer(statusAnswer,
  - { key: keys[0].pem, cert: keys[1] })
  + this.http = https.createServer(
  + { key: keys[0].pem, cert: keys[1] },
  + statusAnswer
  + )
  } else if (keys[0]) {
  - this.http = https.createServer(statusAnswer,
  - { key: keys[0], cert: keys[1] })
  + this.http = https.createServer(
  + { key: keys[0], cert: keys[1] },
  + statusAnswer
  + )
  } else {
  this.http = http.createServer(statusAnswer)
  }
  