Make it obvious that this is a Mixin.
Make it obvious that this is a Mixin.

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