Update CI badge in README

README.md

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 # ML workshop: hands-on jupyter notebooks
 
-[![Build Status](https://travis-ci.org/knutzk/ml-workshop.svg?branch=master)](https://travis-ci.org/knutzk/ml-workshop)
+![Build Status](https://github.com/knutzk/ml-workshop/actions/workflows/build_run_test.yml/badge.svg)
 
 This repository is a collection of jupyter notebooks to teach you the basics of
 machine learning. They provide easy access to out-of-the-box code examples, and