Small bug fix

entry.go

@@ -63,7 +63,7 @@ func NewEntry(title string) (*Entry, error) {
 	}
 
 	return &Entry{
-		ID:      NewID(),
+		ID:      NewID(NewURN()),
 		Title:   text,
 		Updated: NewDate(time.Now()),
 	}, nil

feed.go

@@ -34,7 +34,7 @@ func NewFeed(title string) (*Feed, error) {
 	}
 
 	return &Feed{
-		ID:      NewID(),
+		ID:      NewID(NewURN()),
 		Title:   text,
 		Updated: NewDate(time.Now()),
 	}, nil

id.go

@@ -11,7 +11,7 @@ type ID struct {
 }
 
 // NewID creates a new ID. It returns a *ID.
-func NewID(id string) *ID {
+func NewID(id IRI) *ID {
 	return &ID{URI: IRI(id)}
 }