Make NewCommonAttributes public

generator.go

@@ -17,7 +17,7 @@ type Generator struct {
 // NewGenerator creates a new Generator. It returns a *Generator.
 func NewGenerator(text string) *Generator {
 	return &Generator{
-		CommonAttributes: newCommonAttributes(),
+		CommonAttributes: NewCommonAttributes(),
 		Text:             html.UnescapeString(text),
 	}
 }