unirest 0.4.0 custom media type issue

index.js

"use strict";

var express = require("express");
var bodyParser = require("body-parser");
var unirest = require("unirest");
require("should");
var app = express();
var host, port, url;
var responseData = {message: "some message under a json object"};

describe("unirest", function unirestDescribe () {
	beforeEach(function(done) {
		app.use(bodyParser.json({ type: "application/vnd.api+json" }));

		app.get("/", function handleRoot(req, res) {
			res.set("content-type", "application/vnd.api+json");
			res.send(responseData);
		});

		var server = app.listen(3000, function liftServer () {
			host = server.address().address;
			port = server.address().port;
			//url = `http://${host}:${port}`;
			url = "http://localhost:3000";
			console.log("Example app listening at http://%s:%s", host, port);
			done();
		});
	});

	it("should get a json from the main route", function jsonTest (done) {
		unirest
			.get(url)
			.type("json")
			.end(function endJsonTest(response) {
				response.body.should.eql(responseData);
				done();
			});
	});
});

package.json

{
  "name": "unirest-cmt-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "mocha index.js"
  },
  "author": "nicosommi",
  "license": "MIT",
  "dependencies": {
    "body-parser": "^1.12.3",
    "express": "^4.12.3",
    "mocha": "^2.2.4",
    "should": "^6.0.1",
    "unirest": "^0.4.0"
  }
}