Merge pull request #4 from Jasongzj/master

add getUrl plugins

src/Plugins/FileUrl.php

@@ -0,0 +1,19 @@
+<?php
+
+
+namespace Overtrue\Flysystem\Cos\Plugins;
+
+use League\Flysystem\Plugin\AbstractPlugin;
+
+class FileUrl extends AbstractPlugin
+{
+    public function getMethod()
+    {
+        return 'getUrl';
+    }
+
+    public function handle($path)
+    {
+        return $this->filesystem->getAdapter()->getUrl($path);
+    }
+}