cloud-nuke will now delete KMS Customer Managed Keys. If you wish to avoid nuking KMS Keys, you can either pass in --exclude-resource-type kmscustomerkeys, or specify a config file.
NOTE: This is equivalent to v0.9.2, but released as backward incompatible to indicate a new resource was added to prevent users from inadvertently updating to a new patch release without realizing a new resource is being included in the nuking.