Limit size of log file or rotate

[erjoalgo]

Thank you for maitaing this project, I'm a very happy user.

Recently my VPS ran out of disk space, the culprit was a very large, 160GB sshesame log file.

While I am sure it wouldn't be hard to set up a limit outside of sshesame, perhaps by creating a separate partition, or by setting up a service to periodically delete the file, it would be nice if a log file size limit could be specified directly in sshesame.yaml. Alternatively, some documentation pointing to the recommended way of setting this up externally would be very useful.