HTML getting rendered in the response field

## What you did:

Add this HTML snippet inside the response field. And you will see it render...

```

## What happened:

It rendered the HTML


## Suggested solution:

I think at the moment mockit will only return JSON responses. It would be nice that HTML does not get rendered as HTML, but also maybe give the user an error if HTML was added?

Option 2: We can try and support HTML as responses but not sure what would be involved.

No file or test is named in issue #21. Start by reproducing the HTML rendering in the response field and locating the response-rendering entry point; clarify whether HTML should be escaped or supported, then verify the chosen behavior with a regression test.

Written by the indexing model from the issue text.