Material Design compatibility with PHP 7.2

Hello,

thank you for the great plugin. I ran a scan to check the plugin compatibility with PHP 7.2. Below are the results. Hope to have helped.

Rgs

IM

FILE: /wp-content/plugins/material-design-for-contact-form-7/freemius/includes/fs-essential-functions.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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173 | WARNING | Function name “__fs” is discouraged; PHP has reserved all method names with a double underscore prefix for future use
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