- Version 0.1 :
        Initial release.

- Version 0.2 :
        New fingerprints.
        Keep scanning even when the server closed the connection.
        Display 3 hypothesis.
        Evaluate vulnerability level to PASV port prediction attacks.

- Version 0.3 :
        More accurate fingerprints.

- Version 0.4 :
        Check for ESTP/ESTA.
        Don't give up when a command times out.
        More fingerprints.