Add serializing RSS items and change NewFeed to New

rss/feed_test.go

@@ -31,7 +31,7 @@ func Test_RSSFeed(t *testing.T) {
 		},
 	}
 	for _, c := range cases {
-		feed, items, err := NewFeed(s.URL, c.itemFilter, c.contentFilter)
+		feed, items, err := New(s.URL, c.itemFilter, c.contentFilter)
 		if err != nil {
 			t.Errorf("couldn't create new feed %v: %v", feed, err)
 		}