Update build status badge to filter on master branch

Author: bkoelman

README.md

@@ -5,7 +5,7 @@
 # JsonApiDotNetCore
 A framework for building [JSON:API](http://jsonapi.org/) compliant REST APIs using .NET Core and Entity Framework Core. Includes support for [Atomic Operations](https://jsonapi.org/ext/atomic/).
 
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+[![Build](https://github.com/json-api-dotnet/JsonApiDotNetCore/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/json-api-dotnet/JsonApiDotNetCore/actions/workflows/build.yml?query=branch%3Amaster)
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