title: graphene-django: 'Meta.model' without either 'Meta.fields' or 'Meta.exclude' has been deprecated since 0.15.0 and is now disallowed
body: <p>I'm trying to return filtered results using django-graphene but it gives an error about <a href="https://i.stack.imgur.com/7ibqt.png" rel="nofollow noreferrer">error-message</a></p>
  <pre><code>class PatientType(DjangoObjectType):
      class Meta:
          model = Patients
          exclude = ('active',)
          interfaces = (relay.Node,)
  
  
  class PatientsQuery(ObjectType):
      get_patient = graphene.Field(PatientType, id=graphene.Int())
      all_patients = graphene.List(
          PatientType, first=graphene.Int(), skip=graphene.Int(), phone_no=graphene.Int()
      )
      upcoming_appointments = DjangoFilterConnectionField(PatientType)
  
  
  @permissions_checker([IsAuthenticated, CheckIsOrganizationActive])
  def resolve_upcoming_appointments(self, info, **kwargs) -&gt; List:
      d = datetime.today() - timedelta(hours=1)
      settings.TIME_ZONE  # 'Asia/Karachi'
      aware_datetime = make_aware(d)
      res = Patients.objects.filter(appointments__booking_date__gte=aware_datetime,
                                    appointments__booking_date__day=aware_datetime.day,
                                    appointments__status=True)
      if res:
          return res
      return []
  
  
  class Query(
      organization_schema.OrganizationQuery,
      inventory_schema.MedicineQuery,
      patient_schema.PatientsQuery,
      graphene.ObjectType,
  ):
      pass
  </code></pre>