Update composer.json for PHP 7.2

vendor/symfony/polyfill-intl-normalizer/bootstrap80.php

@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\Polyfill\Intl\Normalizer as p;
+
+if (!function_exists('normalizer_is_normalized')) {
+    function normalizer_is_normalized(?string $string, ?int $form = p\Normalizer::FORM_C): bool { return p\Normalizer::isNormalized((string) $string, (int) $form); }
+}
+if (!function_exists('normalizer_normalize')) {
+    function normalizer_normalize(?string $string, ?int $form = p\Normalizer::FORM_C): string|false { return p\Normalizer::normalize((string) $string, (int) $form); }
+}