Update README.md

README.md

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 [![Latest Version on Packagist](https://img.shields.io/packagist/v/spatie/laravel-webhook-server.svg?style=flat-square)](https://packagist.org/packages/spatie/laravel-webhook-server)
 [![Build Status](https://img.shields.io/travis/spatie/laravel-webhook-server/master.svg?style=flat-square)](https://travis-ci.org/spatie/laravel-webhook-server)
 [![Quality Score](https://img.shields.io/scrutinizer/g/spatie/laravel-webhook-server.svg?style=flat-square)](https://scrutinizer-ci.com/g/spatie/laravel-webhook-server)
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 [![Total Downloads](https://img.shields.io/packagist/dt/spatie/laravel-webhook-server.svg?style=flat-square)](https://packagist.org/packages/spatie/laravel-webhook-server)
 
 A webhook is a way for an app to provide information to another app about a particular event. The way the two apps communicate is with a simple HTTP request.