Fixed README badges

Author: mathmarques

Diff for: README.md

@@ -1,7 +1,7 @@
 # Slim Framework
 
-[![Build Status](https://travis-ci.org/slimphp/Slim.svg?branch=develop)](https://travis-ci.org/slimphp/Slim)
-[![Coverage Status](https://coveralls.io/repos/slimphp/Slim/badge.svg)](https://coveralls.io/r/slimphp/Slim)
+[![Build Status](https://travis-ci.org/slimphp/Slim.svg?branch=3.x)](https://travis-ci.org/slimphp/Slim)
+[![Coverage Status](https://coveralls.io/repos/github/slimphp/Slim/badge.svg?branch=3.x)](https://coveralls.io/github/slimphp/Slim?branch=3.x)
 [![Total Downloads](https://poser.pugx.org/slim/slim/downloads)](https://packagist.org/packages/slim/slim)
 [![License](https://poser.pugx.org/slim/slim/license)](https://packagist.org/packages/slim/slim)