Initial release with production Semantic Versioning, part of Cloud Posse's general policy to convert to production versioning as we make updates to relatively mature modules, especially those where we see breaking changes coming in the near future. This release is exactly the same as v0.28.1.
We anticipate breaking changes (or at least changes that may cause resources to be moved from one Terraform "address" to another) in the near future (to be released as v2.0.0) as we add additional IPv6 support and support for AWS IP Address Manager (IPAM) along with additional changes for robustness.