Give the possibility to the SearchResult object as JSON

[carlosmfnt]

I'm implementing this package, and I'm trying to use Vue.js to render the results, for which I need the data to be in JSON format, but when I try to json_encode() the SearchResult object, the Hits are returned empty, just like this:

{"current_page":1,"data":[{},{},{},{},{},{},{},{},{},{}],"first_page_url":"\/?page=1","from":1,"next_page_url":"\/?page=2","path":"\/","per_page":10,"prev_page_url":null,"to":10}

I think it would be a great addition.

[freekmurze]

Feel free to send a PR for this 👍