Update README.md

Author: ddrv

README.md

@@ -1,6 +1,6 @@
 [![Latest Stable Version](https://img.shields.io/packagist/v/ddrv/mailer.svg?style=flat-square)](https://packagist.org/packages/ddrv/mailer)
 [![Total Downloads](https://img.shields.io/packagist/dt/ddrv/mailer.svg?style=flat-square)](https://packagist.org/packages/ddrv/mailer/stats)
-[![License](https://img.shields.io/packagist/l/ddrv/mailer.svg?style=flat-square)](https://github.com/ddrv/mailer/blob/master/LICENSE.md)
+[![License](https://img.shields.io/packagist/l/ddrv/mailer.svg?style=flat-square)](https://github.com/ddrv/mailer/blob/master/LICENSE)
 [![PHP](https://img.shields.io/packagist/php-v/ddrv/mailer.svg?style=flat-square)](https://php.net)