Is your feature request related to a problem? Please describe.

My mobile engineers want to read the openapi.json file that our backend serves, but it is not pretty.

Describe the solution you'd like

Use JSON.pretty_generate instead of JSON.dump in RSwag::API::Middleware#unload_swagger. The output will more closely match the input and be more readable.

What support could we give you, so you could implement this yourself?

I'll have a PR up shortly.

Describe alternatives you've considered

We considered switching to YAML because it's more readable by default, but we have Strings that look like Dates which is broken. (See #562)