[#2] Add Travis' badge
[#2] Add Travis' badge

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