Added turbo:goal support

test/expectedOutput/goal.xml

@@ -0,0 +1 @@
+<rss xmlns:yandex="http://news.yandex.ru" xmlns:media="http://search.yahoo.com/mrss/" xmlns:turbo="http://turbo.yandex.ru" version="2.0"><channel><title><![CDATA[title]]></title><link>http://example.com/rss.xml</link><description><![CDATA[description]]></description><language>ru</language><item turbo="true"><link>http://example.com/article4?this&amp;that</link><pubDate>Sat, 26 May 2018 21:00:00 GMT</pubDate><author>vvm.space</author><turbo:goal type="yandex" turbo-goal-id="turbo-goal-id" name="order" id="12345"/><turbo:content><![CDATA[<header><figure><img src="http://example.com/example.png" /></figure> <h1>item title</h1></header><p>hello</p>]]></turbo:content><yandex:related><link url="http://example.com/related/post1" img="http://example.com/i/img1.jpg">related link text 1</link><link url="http://example.com/related/post2" img="http://example.com/i/img2.jpg">related link text 2</link></yandex:related></item></channel></rss>

test/index.js

@@ -132,3 +132,40 @@ test('menu', function (t) {
 
     t.equal(feed.xml(), expectedOutput.menu.trim());
 });
+
+test('goals',  function (t) {
+    t.plan(1);
+    let feed = new TR({
+        title: 'title',
+        description: 'description',
+        link: 'http://example.com/rss.xml',
+        site_url: 'http://example.com'
+    });
+
+    feed.item({
+        title: 'item title',
+        image_url: 'http://example.com/example.png',
+        url: 'http://example.com/article4?this&that',
+        author: 'vvm.space',
+        date: 'May 27, 2018 00:00 AM',
+        menu: '<a href="http://example.com/page1.html">Текст ссылки</a> <a href="http://example.com/page2.html">Текст ссылки</a>',
+        goals: [{
+            type: "yandex",
+            id: "turbo-goal-id",
+            counter_id: "12345",
+            name: "order",
+        }],
+        content: '<p>hello</p>',
+        related: [{
+            link: 'http://example.com/related/post1',
+            image_url: 'http://example.com/i/img1.jpg',
+            text: 'related link text 1'
+        }, {
+            link: 'http://example.com/related/post2',
+            image_url: 'http://example.com/i/img2.jpg',
+            text: 'related link text 2'
+        }]
+    });
+
+    t.equal(feed.xml(), expectedOutput.goal.trim());
+});