Update README.md

Author: WeihanLi

README.md

@@ -4,6 +4,8 @@ ASP.NET Core Web extensions
 
 [![WeihanLi.Web.Extensions](https://img.shields.io/nuget/v/WeihanLi.Web.Extensions)](https://www.nuget.org/packages/WeihanLi.Web.Extensions/)
 
+[![WeihanLi.Web.Extensions](https://img.shields.io/nuget/vpre/WeihanLi.Web.Extensions)](https://www.nuget.org/packages/WeihanLi.Web.Extensions/absoluteLatest)
+
 [![Azure Pipelines Build Status](https://weihanli.visualstudio.com/Pipelines/_apis/build/status/WeihanLi.WeihanLi.Web.Extensions?branchName=dev)](https://weihanli.visualstudio.com/Pipelines/_build/latest?definitionId=19&branchName=dev)
 
 [![Github Actions Build Status](https://github.com/WeihanLi/WeihanLi.Web.Extensions/workflows/dotnetcore/badge.svg)](https://github.com/WeihanLi/WeihanLi.Web.Extensions/actions?query=workflow%3Adotnetcore)