PHP Compatibility Checker for PHP 7.0

Hi,

I ran PHP Compatibility Checker to check plugins for PHP 7.0 compatibility and I got this warning message. Is this important ? Can I upgrade to PHP 7.0 anyway?

FILE: /home1/mthrtasc/public_html/wp-content/plugins/what-the-file/what-the-file.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 303 | WARNING | Function name "__what_the_file_main" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
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Thanks,

Fran?ois

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