chore(readme): update badge

Author: taktakpeops

README.md

@@ -1,6 +1,6 @@
 # jest-environment-browserstack
 
-[![Actions Status](https://github.com/taktakpeops/jest-environment-browserstack/workflows/Node%20CI/badge.svg)](https://github.com/taktakpeops/jest-environment-browserstack/actions) [![npm version](http://img.shields.io/npm/v/jest-environment-browserstack.svg?style=flat)](https://npmjs.org/package/jest-environment-browserstack 'View this project on npm') [![Codacy Badge](https://api.codacy.com/project/badge/Grade/7b1839cead7743a69be711dd6c1c022c)](https://www.codacy.com/manual/taktakpeops/jest-environment-browserstack?utm_source=github.com&utm_medium=referral&utm_content=taktakpeops/jest-environment-browserstack&utm_campaign=Badge_Grade) [![lerna](https://img.shields.io/badge/maintained%20with-lerna-cc00ff.svg)](https://lerna.js.org/)
+![master](https://github.com/taktakpeops/jest-environment-browserstack/workflows/master/badge.svg) [![npm version](http://img.shields.io/npm/v/jest-environment-browserstack.svg?style=flat)](https://npmjs.org/package/jest-environment-browserstack 'View this project on npm') [![Codacy Badge](https://api.codacy.com/project/badge/Grade/7b1839cead7743a69be711dd6c1c022c)](https://www.codacy.com/manual/taktakpeops/jest-environment-browserstack?utm_source=github.com&utm_medium=referral&utm_content=taktakpeops/jest-environment-browserstack&utm_campaign=Badge_Grade) [![lerna](https://img.shields.io/badge/maintained%20with-lerna-cc00ff.svg)](https://lerna.js.org/)
 
 Use Jest as test-runner for running your visual-tests and more using Browserstack.