Update README.md

Added standard tag

Author: NejcZdovc

README.md

@@ -9,6 +9,7 @@
 [![Navbar Tests](https://badges.herokuapp.com/travis/brave/browser-laptop?env=TEST_DIR=navbar-components&label=navbar-components-tests)](https://travis-ci.org/brave/browser-laptop)
 [![Tab Tests](https://badges.herokuapp.com/travis/brave/browser-laptop?env=TEST_DIR=tab-components&label=tab-components-tests)](https://travis-ci.org/brave/browser-laptop)
 [![codecov.io](https://codecov.io/github/brave/browser-laptop/coverage.svg?branch=master)](https://codecov.io/gh/brave/browser-laptop?branch=master)
+[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 
 # Brave Browser