Validation does not support other line delimiter than \n

[pierreboissinot]

Given a CSV file using \r as line_delimiter, the validation fails:

Expected columns not found

import/Subscriber/ValidateCSVHeadersSubscriber.php

Line 45 in 781f223

$headers = fgetcsv($fh, 0, $config['load']['format_options']['field_delimiter']);

fgetcsv uses \n