Check for new updates API

[teon]

In order for #110 to work, we need an update service, that will work in our infrastructure. As this is not a part of defguard package but a service running in our internal infrastructure please follow these instructions: https://github.com/teonite/update-service/issues/1

[wojcik91]

Leaving this cool admin theme for reference: https://github.com/unfoldadmin/django-unfold