message: Improve readme badges
diff: A superset of Roku's BrightScript language. Compiles to standard BrightScript.
  -[![build](https://img.shields.io/github/workflow/status/rokucommunity/brighterscript/build.svg?logo=github)](https://github.com/rokucommunity/brighterscript/actions?query=workflow%3Abuild)
  -[![Coverage Status](https://coveralls.io/repos/github/rokucommunity/brighterscript/badge.svg?branch=master)](https://coveralls.io/github/rokucommunity/brighterscript?branch=master)
  -[![NPM Version](https://badge.fury.io/js/brighterscript.svg?style=flat)](https://npmjs.org/package/brighterscript)
  -
  +[![build status](https://img.shields.io/github/workflow/status/rokucommunity/brighterscript/build.svg?logo=github)](https://github.com/rokucommunity/brighterscript/actions?query=workflow%3Abuild)
  +[![coverage status](https://img.shields.io/coveralls/github/rokucommunity/brighterscript?logo=coveralls)](https://coveralls.io/github/rokucommunity/brighterscript?branch=master)
  +[![monthly downloads](https://img.shields.io/npm/dm/brighterscript.svg?sanitize=true&logo=npm&logoColor=)](https://npmcharts.com/compare/brighterscript?minimal=true)
  +[![npm version](https://img.shields.io/npm/v/brighterscript.svg?logo=npm)](https://www.npmjs.com/package/brighterscript)
  +[![license](https://img.shields.io/npm/l/brighterscript.svg)](LICENSE)
  +[![Slack](https://img.shields.io/badge/Slack-RokuCommunity-4A154B?logo=slack)](https://join.slack.com/t/rokudevelopers/shared_invite/zt-4vw7rg6v-NH46oY7hTktpRIBM_zGvwA)
  ## Overview
  