last ping structure is overly verbose

[yschimke]

  "last_ping": {
    "date": "2018-08-17 06:49:23.000000",
    "timezone_type": 3,
    "timezone": "UTC"
  },

why not just a ISO 8601 time as a string? what is timezone type?

[tiggreen]

Good one @yschimke, it's a Carbon, a wrapper around PHP's Date class. But I think we can simplify it! Thanks :)