search(): smaller results by default, new metadata.truncated property

Search results no longer include http.html (with the default minify=true) or smb.raw, as they can be several MB per banner. To get them, request them with fields:

https://api.shodan.io/shodan/host/search?key=YOUR_API_KEY&query=product:nginx&minify=false&fields=ip_str,port,http.html

Banners that had fields removed list them in metadata.truncated, for example "metadata": {"truncated": ["smb.raw"]}. Historical banners from /shodan/host/{ip}?history=true do the same when large fields are removed.