docs: update README

README.md

@@ -37,6 +37,11 @@ This tool supports backing up the following files or directories.
 - `attachments` (directory)
 - `sends` (directory)
 
+And the following ways of notifying backup results are supported.
+
+- Ping (only send on success)
+- Mail (SMTP based, send on success and on failure)
+
 <br>
 
 

README_zh.md

@@ -37,6 +37,11 @@
 - `attachments` (目录)
 - `sends` (目录)
 
+并且支持以下通知备份结果的方式。
+
+- Ping (仅成功时发送)
+- Mail (基于 SMTP，成功时和失败时都会发送)
+
 <br>