Update README.md

Author: PWhiddy

README.md

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 ## The library powering [Shader Park 🔮](https://shaderpark.com)     
-[![Build Status](https://travis-ci.com/shader-park/shader-park-core.svg?branch=master)](https://travis-ci.com/shader-park/shader-park-core)  
+![Build Status](https://github.com/shader-park/shader-park-core/actions/workflows/node.js.yml/badge.svg)
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 Shader Park simplifies creating procedural graphics using javascript.  
 With just a few lines of code, create shaders which are: