Cain currently supports AWS S3.

Support for Minio S3 has already been added to skbn, so adding support to cain would be fairly simple - update Gopkg.toml and Gopkg.lock to the latest skbn version (0.4.0).

This will probably require changing additional dependencies in Gopkg.toml to match the same dependencies versions as in skbn.

Once a PR is merged and version is tagged, we can update the official incubator/cassandra image tag and docs to contribute it to the community.