fix: make processes also update if their parent changes

[ssaavedra]

When a process dies, there is no way in your crate to note that the process' PPID is updated. This happens because even if you ask to update "everything", the condition for updating the process requires the process's start time differs and does not take into account if the PPID has changed through the lifetime of the process.

This is relevant for example if you want to use this crate to monitor orphaned processes.

[GuillaumeGomez]

Looks good to me, thanks! Could you add a test for it as well please?

Please also run cargo fmt.

[GuillaumeGomez]

One thing I thought: in case the parent PID changed, shouldn't we only update the parent PID in the process instead of everything?

[GuillaumeGomez]

I did #1239 so closing this.

[ssaavedra]

Thanks, sorry I had badly configured notifications for this repo and I never got your comments to the right place. Thanks for merging work doing this :)