Add beeyev/disposable-email-filter-php

README.md

 * [Stampie](https://github.com/Stampie/Stampie) - A library for email services such as [SendGrid](https://sendgrid.com/en-us), [PostMark](https://postmarkapp.com), [MailGun](https://www.mailgun.com/) and [MailChimp](https://mailchimp.com/features/transactional-email/).
 * [SwiftMailer](https://swiftmailer.symfony.com) - A mailer solution.
 * [Symfony Mailer](https://github.com/symfony/mailer) - A powerful library for creating and sending emails.
+* [Disposable email filter](https://github.com/beeyev/disposable-email-filter-php) - Disposable (temporary/throwaway/fake) email detection library.
 
 ### Files
 *Libraries for file manipulation and MIME type detection.*