v0.2.0

Features:

1. Independed processes with setsid.

FIxes:

1. Sentinel can start now only single bash command.
2. Fix flock issue when sometime subshell cant check process status.
3. Change way to run task with multiline sudo exec.
4. Fix issue while Sentinel could not start with erorr "already running"
5. Fix duplicated status issue
6. Task config now can access $pid_file and no need to setup pid_file in it.