Variable "google_logging_enabled" is declared but not used

[d-costa]

First of all, thank you for developing this module, it is extremely useful.

I noticed the variable google_logging_enabled is not used, and the monitoring variable is used to set the logging metadata on the compute instance. Is this behavior intended?

https://github.com/bschaatsbergen/terraform-gce-atlantis/blob/263a41ab20befe5c9a8f7b584ae6e2a6e69c4167/main.tf#L132-L133

PS: I don't mind raising a PR if this is indeed not intended

[bschaatsbergen]

Thanks for raising this issue @d-costa :)