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

plugins/php-imap/vendor/illuminate/contracts/Routing/BindingRegistrar.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Illuminate\Contracts\Routing;
+
+interface BindingRegistrar
+{
+    /**
+     * Add a new route parameter binder.
+     *
+     * @param  string  $key
+     * @param  string|callable  $binder
+     * @return void
+     */
+    public function bind($key, $binder);
+
+    /**
+     * Get the binding callback for a given binding.
+     *
+     * @param  string  $key
+     * @return \Closure
+     */
+    public function getBindingCallback($key);
+}