Put XML tag on its own line

rss.go

@@ -229,7 +229,7 @@ func NewFeed() *Feed {
 	}
 }
 
-func (f *Feed) ToXML() (string, error) {
+func (f *Feed) ToXML(encoding string) (string, error) {
 	if err := f.check(); err != nil {
 		return "", fmt.Errorf("error checking RSS feed: %v", err)
 	}
@@ -239,5 +239,5 @@ func (f *Feed) ToXML() (string, error) {
 		return "", fmt.Errorf("error XML encoding feed: %v", err)
 	}
 
-	return `<?xml version="1.0" encoding="UTF-8"?>` + string(xml), nil
+	return fmt.Sprintln(`<?xml version="1.0" encoding="`+encoding+`"?>`) + string(xml), nil
 }