Add GH Actions status to readme

Author: vbfox

Readme.md

@@ -2,9 +2,7 @@
 
 ![color drops Logo](https://raw.githubusercontent.com/vbfox/ColoredPrintf/master/src/BlackFox.ColoredPrintf/Icon.png)
 
-[![AppVeyor Build status](https://ci.appveyor.com/api/projects/status/19hodvli3yq1andd/branch/master?svg=true)](https://ci.appveyor.com/project/vbfox/coloredprintf/branch/master)
-[![Travis-CI Build status](https://travis-ci.org/vbfox/ColoredPrintf.svg?branch=master)](https://travis-ci.org/vbfox/ColoredPrintf)
-[![VSTS Status](https://vbfox.visualstudio.com/ColoredPrintf/_apis/build/status/ColoredPrintf%20CI?branchName=master)](https://vbfox.visualstudio.com/ColoredPrintf/_build/latest?definitionId=5&branchName=master)
+[![Github Actions Status](https://github.com/vbfox/ColoredPrintf/actions/workflows/main.yml/badge.svg)](https://github.com/vbfox/ColoredPrintf/actions/workflows/main.yml?query=branch%3Amaster)
 [![Nuget Package](https://img.shields.io/nuget/v/BlackFox.ColoredPrintf.svg)](https://www.nuget.org/packages/BlackFox.ColoredPrintf)
 
 This library provide a replacement to F# `printf` function with color support.