Fix NuGet badge

Use shields.io for NuGet badge.

Author: martincostello

README.md

@@ -7,7 +7,7 @@ Swashbuckle.AspNetCore
 
 [![Build status](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/actions/workflows/build.yml/badge.svg?branch=master&event=push)](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Code coverage](https://codecov.io/gh/domaindrivendev/Swashbuckle.AspNetCore/branch/master/graph/badge.svg)](https://codecov.io/gh/domaindrivendev/Swashbuckle.AspNetCore) [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/domaindrivendev/Swashbuckle.AspNetCore/badge)](https://securityscorecards.dev/viewer/?uri=github.com/domaindrivendev/Swashbuckle.AspNetCore)
 
-[![NuGet](https://buildstats.info/nuget/Swashbuckle.AspNetCore)](https://www.nuget.org/packages/Swashbuckle.AspNetCore/ "Download Swashbuckle.AspNetCore from NuGet.org")
+[![NuGet](https://img.shields.io/nuget/v/Swashbuckle.AspNetCore?logo=nuget&label=NuGet&color=blue)](https://www.nuget.org/packages/Swashbuckle.AspNetCore/ "Download Swashbuckle.AspNetCore from NuGet.org")
 
 [![Help Wanted](https://img.shields.io/github/issues/domaindrivendev/Swashbuckle.AspNetCore/help-wanted?style=flat&color=%24EC820&label=Help%20wanted)](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/labels/help-wanted)