This release focuses contains a complete re-write of resource dynatrace_management_zone, as the previous solution had #15 as a consequence.
Just a word of caution about using existing .tf files for management zones: The previous schema is still valid, but it was necessary to deprecate a lot of the properties and replace them with different ones. It's recommended to re-create these .tf files in order for terraform plan to be convinced that there are no changes left to be applied.