Update README.md

Author: myloveCc

README.md

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 # 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-2.0.1-orange.svg)](https://github.com/jstedfast/MailKit)
+[![NETCore CLR](https://img.shields.io/badge/.NETCore%20Clr-3.1-brightgreen)](https://www.microsoft.com/net/core)
+[![MailKit](https://img.shields.io/badge/MailKit-2.6.0-orange)](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)
 [![GitHub-Actions-Img]](https://github.com/myloveCc/NETCore.MailKit/actions)