Add response headers to mock

[jormaechea]

Currently, responses don't include the headers defined in the schema.

For example:

paths:
  /hello:
    get:
      summary: Hello world
      responses:
        '200':
          description: OK
          headers:
            x-foo:
              schema:
                type: string
                example: bar
          content:
            application/json:
              schema:
                type: object
                properties:
                  foo:
                    type: string

Should return x-foo: bar as a response header.

[sem4phor]

Any reasons why the commit which is solving this isnt released yet?

[jormaechea]

@danielgtaylor I saw you had already made this in you last commit.
Unfortunately, we are using you docker image and we need a new release.

When do you think you could tackle that?
Thanks in advance!