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

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

@@ -0,0 +1,27 @@
+<?php
+
+namespace Illuminate\Contracts\Foundation;
+
+interface CachesConfiguration
+{
+    /**
+     * Determine if the application configuration is cached.
+     *
+     * @return bool
+     */
+    public function configurationIsCached();
+
+    /**
+     * Get the path to the configuration cache file.
+     *
+     * @return string
+     */
+    public function getCachedConfigPath();
+
+    /**
+     * Get the path to the cached services.php file.
+     *
+     * @return string
+     */
+    public function getCachedServicesPath();
+}