PHP compatibility warning (PHP >= 7.0)

[estevao90]

I found a small issue that affects the PHP compatibility. It's a warning:

FILE: src/Rules/Numeric.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 17 | WARNING | 'numeric' is a soft reserved keyword as of PHP
    |         | version 7.0 and should not be used to name a class,
    |         | interface or trait or as part of a namespace (class
    |         | declaration)
    |         | (PHPCompatibility.Keywords.ForbiddenNames.numericFound)
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