Revised the build badge.

readme.md

@@ -2,7 +2,7 @@
 =============
 [![Join the chat at https://gitter.im/sharpsnmplib](https://img.shields.io/gitter/room/sharpsnmplib/Lobby.svg?style=flat-square)](https://gitter.im/sharpsnmplib/Lobby?utm_source=share-link&utm_medium=link&utm_campaign=share-link)
 [![NuGet Version](https://img.shields.io/nuget/v/Lextm.SharpSnmpLib.svg?style=flat-square)](https://www.nuget.org/packages/Lextm.SharpSnmpLib/)
-[![Build](https://img.shields.io/github/workflow/status/lextudio/sharpsnmplib/.NET%20Core?style=flat-square)](https://github.com/lextudio/sharpsnmplib/actions/workflows/dotnetcore.yml)
+[![Build](https://img.shields.io/github/actions/workflow/status/lextudio/sharpsnmplib/dotnetcore.yml?branch=master&style=flat-square)](https://github.com/lextudio/sharpsnmplib/actions/workflows/dotnetcore.yml)
 [![Coverage](https://img.shields.io/coveralls/github/lextudio/sharpsnmplib?style=flat-square)](https://coveralls.io/github/lextudio/sharpsnmplib)
 
 This is the source code repository of #SNMP Library. Visual Studio 2019 and .NET Core SDK (for .NET Core 2.1 and above) is required to compile it on Windows.