Changelog.

*New version: 0.0.3*

*Fixed ssh known-hosts bug and more.*

Description:
* Unknown hosts now will be added automatically;
* In docker removed known-hosts file mounting as volume;
* Fixed stdout and stderr handling.
* Fixed stdout message formatting.

*Added systemctl support.*

Description:
* Added systemctl status to check service state.
* Added systemctl start, stop, restart actions.
* Added systemctl cat to show System-unit configuration.