Update README.md; Add branch to coveralls badge

Author: joelbladt

README.md

@@ -2,7 +2,7 @@
 
 <p align="center">
 <a href="https://github.com/laravel/framework/actions"><img src="https://github.com/laravel/framework/workflows/tests/badge.svg" alt="Build Status"></a>
-<a href="https://coveralls.io/github/laravel/framework"><img src="https://coveralls.io/repos/github/laravel/framework/badge.svg" alt="Coverage Status" /></a>
+<a href="https://coveralls.io/github/laravel/framework"><img  src="https://img.shields.io/coverallsCoverage/github/laravel/framework?branch=10.x" alt="Coveralls"></a>
 <a href="https://packagist.org/packages/laravel/framework"><img src="https://img.shields.io/packagist/dt/laravel/framework" alt="Total Downloads"></a>
 <a href="https://packagist.org/packages/laravel/framework"><img src="https://img.shields.io/packagist/v/laravel/framework" alt="Latest Stable Version"></a>
 <a href="https://packagist.org/packages/laravel/framework"><img src="https://img.shields.io/packagist/l/laravel/framework" alt="License"></a>