Improved error message

[wolfadex]

elm-open-api-cli/src/OpenApi/Generate.elm

Lines 2159 to 2162 in 3b16258

	("Among the "
	++ String.fromInt (Dict.size responses)
	++ " possible responses, there was no successful one."
	)

This error message could be improved to give examples of how to resolve it. An example of the output might look like

Warning: Among the 1 possible responses, there was no successful one.

  at /vats/{id} -> GET
  at /tenants/{id} -> GET
  at /tenants -> GET  

Make sure your spec defines a 2XX and/or 3XX response for these endpoints.