Update README.md

Author: myloveCc

README.md

@@ -1,7 +1,7 @@
 # NETCore.MailKit
 [![NuGet](https://img.shields.io/nuget/v/NETCore.MailKit.svg)](https://nuget.org/packages/NETCore.MailKit)
 [![NETCore CLR](https://img.shields.io/badge/.NETCore%20Clr-2.0-brightgreen.svg)](https://www.microsoft.com/net/core)
-[![MailKit](https://img.shields.io/badge/MailKit-1.18.1.1-orange.svg)](https://github.com/jstedfast/MailKit)
+[![MailKit](https://img.shields.io/badge/MailKit-2.0.1-orange.svg)](https://github.com/jstedfast/MailKit)
 [![license](https://img.shields.io/github/license/myloveCc/NETCore.MailKit.svg)](https://github.com/myloveCc/NETCore.MailKit/blob/master/lICENSE)