function init () {
  const get = require('simple-get')
  get.concat(ANNOUNCEMENT_URL, onResponse)
}
In certain situations, the WebTorrent team may need to show an announcement to
all WebTorrent Desktop users. For example: a security notice, or an update
notification (if the auto-updater stops working).

When there is an announcement, the `ANNOUNCEMENT_URL` endpoint should return an
HTTP 200 status code with a JSON object like this:

  {
    "title": "WebTorrent Desktop Announcement",
    "message": "Security Issue in v0.xx",
    "detail": "Please update to v0.xx as soon as possible..."
  }