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

plugins/php-imap/vendor/illuminate/contracts/Validation/UncompromisedVerifier.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Illuminate\Contracts\Validation;
+
+interface UncompromisedVerifier
+{
+    /**
+     * Verify that the given data has not been compromised in data leaks.
+     *
+     * @param  array  $data
+     * @return bool
+     */
+    public function verify($data);
+}