Removed `--format-option response.as` an promote `--response-as`: using
the format option would be misleading as it is now also used by non-prettified
responses.
* Allow to override the response `Content-Type` from options
* Apply suggestions from code review
Co-authored-by: Jakub Roztocil <jakub@roztocil.co>
* Rename the option from `--response.content-type` to `--response-as`
* Update CHANGELOG.md
Co-authored-by: Jakub Roztocil <jakub@roztocil.co>