Adds the xhrCache option

This adds xhrCache: false as an option.

Specifies if the XHR cache should be inlined into the page. The XHR cache is used to prevent duplicate requests from occuring in the client when hydrating from server-rendering HTML. In some cases you might not use XHR in the client and therefore want to prevent the script from being included.

const ssr = require('done-ssr');

const render = ssr({}, {
  xhrCache: false
});