Updating CI status badge (#3953)

Updated CI status badge to show Github workflow status

README.md

@@ -2,7 +2,7 @@
 
 [![npm version](https://img.shields.io/npm/v/axios.svg?style=flat-square)](https://www.npmjs.org/package/axios)
 [![CDNJS](https://img.shields.io/cdnjs/v/axios.svg?style=flat-square)](https://cdnjs.com/libraries/axios)
-[![build status](https://img.shields.io/travis/axios/axios/master.svg?style=flat-square)](https://travis-ci.org/axios/axios)
+[![Build status](https://github.com/axios/axios/actions/workflows/ci.yml/badge.svg)
 [![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/axios/axios) 
 [![code coverage](https://img.shields.io/coveralls/mzabriskie/axios.svg?style=flat-square)](https://coveralls.io/r/mzabriskie/axios)
 [![install size](https://packagephobia.now.sh/badge?p=axios)](https://packagephobia.now.sh/result?p=axios)