Update build status badge

Siemienik · web-flow · commit ea3c65d4dc33 · 2020-05-28T02:43:22.000+02:00
diff --git a/README.md b/README.md
@@ -1,6 +1,6 @@
 # ExcelJS
 
-[![Build Status](https://travis-ci.org/exceljs/exceljs.svg?branch=master)](https://travis-ci.org/exceljs/exceljs)
+[![Build status](https://github.com/exceljs/exceljs/workflows/ExcelJS/badge.svg)](https://github.com/exceljs/exceljs/actions?query=workflow%3AExcelJS)
 [![Code Quality: Javascript](https://img.shields.io/lgtm/grade/javascript/g/exceljs/exceljs.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/exceljs/exceljs/context:javascript)
 [![Total Alerts](https://img.shields.io/lgtm/alerts/g/exceljs/exceljs.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/exceljs/exceljs/alerts)
 
