Add support for detecting changes to the mime type of request/response content

[Former user]

If a schema in an OpenApi-file changes the following way, it is not recognized as a difference:

... "content": { "application/vnd.m.v1+json": { "schema": { "$ref": "#/…" } } } ...

to

... "content": { "application/vnd.m.v2+json": { "schema": { "$ref": "#/…" } } } ...

[Ben Sayers]

Currently we do not support any other mime type on the content keyword other than application/json. You can see details of what keywords are supported on our openapi3 spec support docs. I’ll change this ticket to be a feature request for detecting changes in the mime type of the content block.