PHP 7.2 compatibility

Thanks for this plugin! I just ran the PHP compatibility checker and noticed the following:

FILE: content-aware-sidebars/freemius.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: content-aware-sidebars/lib/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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