change post request content-type to application/octet-stream

src/Qiniu/Storage/ResumeUploader.php

@@ -155,7 +155,10 @@ final class ResumeUploader
     private function post($url, $data)
     {
         $this->currentUrl = $url;
-        $headers = array('Authorization' => 'UpToken ' . $this->upToken);
+        $headers = array(
+            'Authorization' => 'UpToken ' . $this->upToken,
+            'Content-Type' => 'application/octet-stream'
+            );
         return Client::post($url, $data, $headers);
     }