Add https:// variant for iconclass

src/enums/MDNodaRepository.php

@@ -78,6 +78,7 @@ public static function fromString(string $input):MDNodaRepository {
             'iconclass' => self::iconclass,
             'Iconclass' => self::iconclass,
             'http://iconclass.org' => self::iconclass,
+            'https://iconclass.org' => self::iconclass,
             'klbb'      => self::klbb,
             'kl-bb'      => self::klbb,
             'lcsh'      => self::lcsh,