Fix post schema for latest marshmallow release
Fix post schema for latest marshmallow release

josuemontano/API-platform,josuemontano/api-starter,josuemontano/API-platform,josuemontano/pyramid-angularjs-starter,josuemontano/API-platform,josuemontano/api-starter,josuemontano/pyramid-angularjs-starter,josuemontano/pyramid-angularjs-starter,josuemontano/api-starter,josuemontano/API-platform