[增添]添加了datasource的setting数据库以及默认值

vendor/vlucas/phpdotenv/src/Exception/ValidationException.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dotenv\Exception;
+
+use RuntimeException;
+
+final class ValidationException extends RuntimeException implements ExceptionInterface
+{
+    //
+}