Make NewLogo more flexible

logo.go

@@ -3,8 +3,6 @@ package atom
 import (
 	"errors"
 	"fmt"
-
-	"github.com/google/uuid"
 )
 
 type Logo struct {
@@ -13,8 +11,8 @@ type Logo struct {
 }
 
 // NewLogo creates a new Logo. It returns a *Logo.
-func NewLogo() *Logo {
-	return &Logo{URI: IRI(fmt.Sprint("urn:uuid:", uuid.New()))}
+func NewLogo(uri string) *Logo {
+	return &Logo{URI: IRI(uri)}
 }
 
 // Check checks the Logo for incompatibilities with RFC4287. It returns an