Update documentation to reflect that VM.Monitor permissions no longer exists

[spothound]

While installing this plugin with the official doc I get:

pveum role add traefik-provider -privs "VM.Audit,VM.Monitor,Sys.Audit,Datastore.Audit"
400 Parameter verification failed.
privs: invalid format - invalid privilege 'VM.Monitor'

According to proxmox roadmap https://pve.proxmox.com/wiki/Roadmap

On Proxmox VE 9.0:

The VM.Monitor privilege is dropped in favor of Sys.Audit for QEMU HMP monitor access and more fine-grained privileges for QEMU guest agent commands. Custom roles referencing the VM.Monitor privilege will need to be adapted after the upgrade. The pve8to9 checklist script detects affected roles. 

The docs should reflect this in https://plugins.traefik.io/plugins/67dd8d209fc1afd96d902040/LICENSE and in this repo README.md

[spothound]

#29

[DimitriyB]

Please add VM.GuestAgent.Audit for the Proxmox 9 because plugin cant get ip address for the vm or the container.