Correct composer dependencies about pdo

I tried to take hoa/database throught composer.
And like you can see here: https://packagist.org/packages/hoa/database, 0 download of this package since all time, so i said "something i wrong !"

And i found the problem after some search, the pdo dependencies in the composer.json isn't good.
(You put ext/pdo but ext-pdo is needed here, more information here: https://getcomposer.org/doc/02-libraries.md#platform-packages)