Add Packagist version badge

Signed-off-by: victor <victor@4uno.org>

Author: victor-c4uno

README.md

@@ -4,6 +4,7 @@
 [![codecov](https://codecov.io/gh/pollin14/laravel-curp-validation/branch/master/graph/badge.svg)](https://codecov.io/gh/pollin14/laravel-curp-validation)
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+[![Version](https://img.shields.io/packagist/v/pollin14/laravel-curp-validation?style=flat)](https://img.shields.io/packagist/v/pollin14/laravel-curp-validation?style=plastic)
 
 A set of validation rules specific to validate Mexico's CURP.
 
@@ -17,7 +18,7 @@ composer require pollin14/laravel-curp-validation
 
 ## Usage
 
-If you are using Laravel >= 6 you can install
+If you are using Laravel >= 6 and PHP >= 7.3 then you can install
 
 ```bash
 composer require illuminatech/validation-composite