v0.2.1

• Validate declared non-JSON media types as far as their schema allows
  instead of reporting every such exchange as a violation (#25). Without a
  schema the body is opaque and passes; with a string-typed schema the raw
  payload is validated as that string value (request.body.schema /
  response.body.schema); any other schema fails closed under the new codes
  request.body.unsupported / response.body.unsupported. Previously a
  declared text/plain or application/octet-stream body was always
  reported as response.body.media_type "not supported" (or
  request.body.decode on the request side), making such operations
  impossible to contract-test.