Update README.md

Author: xPaw

README.md

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 # Valve's KeyValue for .NET
 
-[![Build Status (GitHub)](https://img.shields.io/github/workflow/status/SteamDatabase/ValveKeyValue/.NET%20Core%20CI?label=Build&style=flat-square)](https://github.com/SteamDatabase/ValveKeyValue/actions)
+[![Build Status (GitHub)](https://img.shields.io/github/actions/workflow/status/SteamDatabase/ValveKeyValue/ci.yml?label=Build&style=flat-square&branch=master)](https://github.com/SteamDatabase/ValveKeyValue/actions)
 [![Coverage Status](https://img.shields.io/coveralls/SteamDatabase/ValveKeyValue.svg?label=Test+Coverage&style=flat-square)](https://coveralls.io/github/SteamDatabase/ValveKeyValue)
 [![NuGet](https://img.shields.io/nuget/v/ValveKeyValue.svg?label=NuGet&style=flat-square)](https://www.nuget.org/packages/ValveKeyValue/)