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

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

@@ -0,0 +1,13 @@
+<?php
+
+namespace Illuminate\Contracts\Validation;
+
+interface ValidatesWhenResolved
+{
+    /**
+     * Validate the given class instance.
+     *
+     * @return void
+     */
+    public function validateResolved();
+}