2.15.0

Changes

• Added compression support for all clients via SSHClient(compress=True), ParallelSSHClient(compress=True) and
  HostConfig(compress=True) - defaults to off. #252
• Added "keyboard interactive" login support for native clients. This is fully automated username and password
  authentication via SSH's keyboard interactive authentication mechanism and does not actually require a human at the
  keyboard. Used in cases where the server does not allow any other authentication mechanism.
  Note that server configuration may disallow remote command execution via run_command when keyboard interactive
  authentication is required - use interactive shells to run commands with in such cases. See
  Interactive Shells <https://parallel-ssh.readthedocs.io/en/latest/advanced.html#running-commands-on-shells>_
  documentation. Also supported via HostConfig entries. Currently native clients only.
• Added pssh.exceptions.InvalidAPIUseError for errors raised on client initialisation when an invalid API use is
  detected. For example, keyboard interactive authentication enabled without a password provided.
• Updated minimum ssh2-python and ssh-python requirements.