Added packagist badge

Author: mikefrancis

README.md

@@ -1,6 +1,6 @@
 # Laravel Unleash
 
-[![Build Status](https://travis-ci.org/mikefrancis/laravel-unleash.svg?branch=master)](https://travis-ci.org/mikefrancis/laravel-unleash) [![codecov](https://codecov.io/gh/mikefrancis/laravel-unleash/branch/master/graph/badge.svg)](https://codecov.io/gh/mikefrancis/laravel-unleash)
+[![Packagist](https://img.shields.io/packagist/v/mikefrancis/laravel-unleash)](https://packagist.org/packages/mikefrancis/laravel-unleash) [![Build Status](https://travis-ci.org/mikefrancis/laravel-unleash.svg?branch=master)](https://travis-ci.org/mikefrancis/laravel-unleash) [![codecov](https://codecov.io/gh/mikefrancis/laravel-unleash/branch/master/graph/badge.svg)](https://codecov.io/gh/mikefrancis/laravel-unleash)
 
 An [Unleash](https://unleash.github.io) client for Laravel.