add browsers support section to readme

README.md

@@ -77,6 +77,12 @@ peer.on('call', (call) => {
 npm test
 ```
 
+## Browsers support
+
+| [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/firefox/firefox_48x48.png" alt="Firefox" width="24px" height="24px" />](http://godban.github.io/browsers-support-badges/)</br>Firefox | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/chrome/chrome_48x48.png" alt="Chrome" width="24px" height="24px" />](http://godban.github.io/browsers-support-badges/)</br>Chrome | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/safari/safari_48x48.png" alt="Safari" width="24px" height="24px" />](http://godban.github.io/browsers-support-badges/)</br>Safari | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/opera/opera_48x48.png" alt="Opera" width="24px" height="24px" />](http://godban.github.io/browsers-support-badges/)</br>Opera |
+| --------- | --------- | --------- | --------- |
+| last 4 versions| last 4 versions| 12.1+| last 4 versions
+
 ## FAQ
 
 Q. I have a message ```Critical dependency: the request of a dependency is an expression``` in browser's console