Properly use xml names

link.go

@@ -1,12 +1,14 @@
 package atom
 
 import (
+	"encoding/xml"
 	"errors"
 	"fmt"
 	"strings"
 )
 
 type Link struct {
+	XMLName xml.Name `xml:"link"`
 	*CommonAttributes
 	Title    string      `xml:"title,attr,omitempty"`
 	Href     IRI         `xml:"href,attr"`