readme: tweak CI link

Author: vbfox

Readme.md

@@ -4,7 +4,7 @@
 !["f" Logo](https://raw.githubusercontent.com/vbfox/MasterOfFoo/master/src/BlackFox.MasterOfFoo/Icon.png)
 
 
-[![Github Actions Status](https://github.com/vbfox/MasterOfFoo/actions/workflows/main.yml/badge.svg)](https://github.com/vbfox/MasterOfFoo/actions/workflows/main.yml)
+[![Github Actions Status](https://github.com/vbfox/MasterOfFoo/actions/workflows/main.yml/badge.svg)](https://github.com/vbfox/MasterOfFoo/actions/workflows/main.yml?query=branch%3Amaster)
 [![Nuget Package](https://img.shields.io/nuget/v/BlackFox.MasterOfFoo.svg)](https://www.nuget.org/packages/BlackFox.MasterOfFoo)
 
 A library to allow using `printf` style strings in more places.