Pass through all options if present.

[ioquatix]

I understand there is a compatibility concern here 8e0076a

However, I'd like to try this out (check CI is passing).

[ioquatix]

For reference, it's also possible to achieve what I want using JSON::State.generate directly:

OPTIONS = {indent: "  ", space: " ", space_before: "", object_nl: "\n", array_nl: "\n"}

def self.output(file, value)
  ::JSON::State.generate(value, OPTIONS, file)
  file.puts
end

However, I'm not sure if JSON::State is considered stable public interface.