Strict Standards: Declaration should be compatible #65

Hello,

When using Goodby CSV Export with PHP at E_ALL strict, I'm getting this error:
Strict Standards: Declaration of Goodby\CSV\Export\Standard\CsvFileObject::fputcsv() should be compatible with SplFileObject::fputcsv($fields, $delimiter = NULL, $enclosure = NULL, $escape = NULL) in /Volumes/DATA/Dev/umstudio/ums_redbean/api/vendor/goodby/csv/src/Goodby/CSV/Export/Standard/CsvFileObject.php on line 84

Any ideas?