Use a badge that automatically fetches the supported php versions from packagist

Author: rboonzaijer

README.md

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 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://img.shields.io/github/workflow/status/rboonzaijer/php-array-to-xml/Tests/main"></a>
 <a href="https://github.com/rboonzaijer/php-array-to-xml/blob/main/LICENSE.md"><img src="https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square" alt="License"></a>
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-<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-7.0-green?label=php&style=flat-square"></a>
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-<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.0-green?label=php&style=flat-square"></a>
-<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.1-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://img.shields.io/packagist/php-v/rboonzaijer/php-array-to-xml?style=flat-square"></a>
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