Update README.md

Author: rds1983

README.md

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 # StbImageSharp
-[![NuGet](https://img.shields.io/nuget/v/StbImageSharp.svg)](https://www.nuget.org/packages/StbImageSharp/) [![Build status](https://ci.appveyor.com/api/projects/status/c9eh0e4c70ki26fy?svg=true)](https://ci.appveyor.com/project/RomanShapiro/stbimagesharp) [![Chat](https://img.shields.io/discord/628186029488340992.svg)](https://discord.gg/ZeHxhCY)
+[![NuGet](https://img.shields.io/nuget/v/StbImageSharp.svg)](https://www.nuget.org/packages/StbImageSharp/)
+![Build & Publish](https://github.com/StbSharp/StbImageSharp/workflows/Build%20&%20Publish/badge.svg)
+[![Chat](https://img.shields.io/discord/628186029488340992.svg)](https://discord.gg/ZeHxhCY)
 
 StbImageSharp is C# port of the stb_image.h, which is C library to load images in JPG, PNG, BMP, TGA, PSD, GIF and HDR formats.