Removed useless setUp.
Removed useless setUp.

eodolphi/jsonschema,Julian/jsonschema,mathewmarcus/jsonschema,jamesmarva/jsonschema,eodolphi/jsonschema,varunarya10/jsonschema,Julian/jsonschema,sightmachine/jsonschema,dnephin/jsonschema,python-jsonschema/jsonschema