Add Browser Support Matrix to README.md (mochajs#2590) [ci skip]

* 📝 Add browser support matrix to README

* Make browser matrix smaller

* try again

* yet again

* decrease space between logo and badges

since new browser matrix badge is huge

* going overboard

* getting close to last try

* can be closer?

* hmm

* maybe even..

* Revert "maybe even.."

This reverts commit ea819af.

README.md

@@ -2,11 +2,11 @@
 <p align="center">
   <img src="https://cldup.com/xFVFxOioAU.svg" alt="Mocha test framework"/>
 </p>
-<br><br>
 
 [![Build Status](https://api.travis-ci.org/mochajs/mocha.svg?branch=master)](http://travis-ci.org/mochajs/mocha) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mochajs/mocha?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![OpenCollective](https://opencollective.com/mochajs/backers/badge.svg)](#backers)
 [![OpenCollective](https://opencollective.com/mochajs/sponsors/badge.svg)](#sponsors)
+<br><img alt="Mocha Browser Support h/t SauceLabs" src="https://saucelabs.com/browser-matrix/mochajs.svg" width="354">
 
   Mocha is a simple, flexible, fun JavaScript test framework for node.js and the browser. For more information view the [documentation](http://mochajs.org).