Allow passing of encoding-type for s3 get_bucket_versions without throwing error.
Allow passing of encoding-type for s3 get_bucket_versions without throwing error.

This was a change made in https://github.com/boto/botocore/pull/1794.

william-richard/moto,whummer/moto,whummer/moto,spulec/moto,whummer/moto,whummer/moto,spulec/moto,spulec/moto,william-richard/moto,william-richard/moto,spulec/moto,william-richard/moto,whummer/moto,william-richard/moto,spulec/moto,whummer/moto,william-richard/moto,spulec/moto