.validate() shouldn't accept datapackage as list
.validate() shouldn't accept datapackage as list

sirex/datapackage-py,datapackages/datapackage-py,sirex/datapackage-py,datapackages/datapackage-py,okfn/datapackage-py,okfn/datapackage-py,okfn/datapackage-model-py,okfn/datapackage-model-py