Use ->toString() over ->name in json serialization of MDGender,

MDLicense

This is important for backwards compatibility

src/enums/MDLicense.php

@@ -231,7 +231,7 @@ public function getTledName(MDTlLoader $tlLoader):string {
      */
     public function jsonSerialize():string {
 
-        return $this->name;
+        return $this->toString();
 
     }
 }