add badge for latest packagist version in README

Author: taranovegor

README.md

@@ -1,6 +1,7 @@
 # String Generator
 
 [![CI](https://github.com/taranovegor/string-generator/actions/workflows/ci.yml/badge.svg)](https://github.com/taranovegor/string-generator/actions/workflows/ci.yml)
+[![Latest Version](https://img.shields.io/packagist/v/taranovegor/string-generator.svg)](https://packagist.org/packages/taranovegor/string-generator)
 [![PHPStan Level 9](https://img.shields.io/badge/PHPStan-level%209-brightgreen.svg)](https://phpstan.org/)
 [![PHP 8.2+](https://img.shields.io/badge/PHP-8.2%2B-8892BF.svg)](https://www.php.net/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)