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

plugins/php-imap/vendor/illuminate/contracts/Foundation/ExceptionRenderer.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Illuminate\Contracts\Foundation;
+
+interface ExceptionRenderer
+{
+    /**
+     * Renders the given exception as HTML.
+     *
+     * @param  \Throwable  $throwable
+     * @return string
+     */
+    public function render($throwable);
+}