Is your feature request related to a problem? Please describe.
We regularly update our private instances of Nu Html Checker for years. We would like to know which version is deployed to our private instances through JSON API.

Describe the solution you'd like
If you don’t mind, we would like to add version field to JSON output format.

Current:

{
  "messages": []
}

New:

{
  "version": "XX.Y.Z",
  "messages": []
}

Describe alternatives you've considered
One of alternative solutions is adding new API (like https://example.com/?version&out=json).

Additional context
None