Support the JSON:API standard as a JSON content type

[tomharel]

Is your feature request related to a problem? Please describe.
When using Postman to publish API docs with the JSON:API standard, we have to specify:
Content-Type: application/vnd.api+json

This leads to Postman weirdly formatting example requests as text (i.e. not understanding that the body is actually a JSON object), which makes it hard for implementers to copy paste the request.

For example:

Describe the solution you'd like
Ideally, Postman will recognize application/vnd.api+json as JSON.

[shashankawasthi88]

@tomharel This should be fixed in the latest Postman version. application/vnd.api+json should now be treated as JSON.