Remove the vendor directory in .gitignore as these dependencies are needed for php-imap

plugins/php-imap/vendor/phar-io/version/src/VersionNumber.php

@@ -0,0 +1,28 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Version.
+ *
+ * (c) Arne Blankerts <arne@blankerts.de>, Sebastian Heuer <sebastian@phpeople.de>, Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PharIo\Version;
+
+class VersionNumber {
+
+    /** @var ?int */
+    private $value;
+
+    public function __construct(?int $value) {
+        $this->value = $value;
+    }
+
+    public function isAny(): bool {
+        return $this->value === null;
+    }
+
+    public function getValue(): ?int {
+        return $this->value;
+    }
+}