Make the adapter implement CanOverwriteFiles

Files can be overwritten with Swift (as update does the same than write)
and implementing the interface will save HTTP requests during put and putStream.

src/SwiftAdapter.php

@@ -4,16 +4,17 @@
 
 use GuzzleHttp\Psr7\Stream;
 use GuzzleHttp\Psr7\StreamWrapper;
-use League\Flysystem\Util;
-use League\Flysystem\Config;
 use League\Flysystem\Adapter\AbstractAdapter;
+use League\Flysystem\Adapter\CanOverwriteFiles;
+use League\Flysystem\Adapter\Polyfill\NotSupportingVisibilityTrait;
+use League\Flysystem\Adapter\Polyfill\StreamedCopyTrait;
+use League\Flysystem\Config;
+use League\Flysystem\Util;
 use OpenStack\Common\Error\BadResponseError;
 use OpenStack\ObjectStore\v1\Models\Container;
 use OpenStack\ObjectStore\v1\Models\StorageObject;
-use League\Flysystem\Adapter\Polyfill\NotSupportingVisibilityTrait;
-use League\Flysystem\Adapter\Polyfill\StreamedCopyTrait;
 
-class SwiftAdapter extends AbstractAdapter
+class SwiftAdapter extends AbstractAdapter implements CanOverwriteFiles
 {
     use StreamedCopyTrait;
     use NotSupportingVisibilityTrait;
@@ -87,7 +88,7 @@ public function update($path, $contents, Config $config)
      */
     public function updateStream($path, $resource, Config $config)
     {
-        return $this->write($path, new Stream($resource), $config, Util::getStreamSize($resource));
+        return $this->writeStream($path, $resource, $config);
     }
 
     /**