0.1.0 2024-01-27/15:30

• add support for PID files created by child procs for their child proc
• • add new option pid_file
• • add pids method for returning child pid and the pid from the PID file
• • add pid_from_pid_file for returning the PID from the PID file
• • reads PID file via File::Slurp, so new depend
• add kill method for killing the procs