title: Issue with inheriting from the django-graphene default GraphQLView
body: <p>I have the need to do the following:</p>
  <pre><code>    path(
          '&lt;uuid:uuid&gt;/graphql',
          csrf_exempt(
              viewsets.MyCustomGraphQLView.as_view()
          )
      ),
  </code></pre>
  <p>That is, to pass in a <code>uuid</code> which can reference a different graphql schema dynamically.</p>
  <p>I'm attempting to do something like the following:</p>
  <pre><code>from django.views.generic import View
  from django.shortcuts import get_object_or_404
  
  from graphql.type.schema import GraphQLSchema
  from graphene_django.views import GraphQLView
  
  class MyCustomGraphQLView(
      GraphQLView
  ):
      def __init__(
          self, *args, **kwargs
      ):
          super(MyCustomGraphQLView, self).__init__(*args, **kwargs)
          self.schema = self.get_object().get_schema()
  
          assert isinstance(
              self.schema, GraphQLSchema
          ), &quot;A Schema is required to be provided to GraphQLView.&quot;
  
      def get_queryset(self, *args, **kwargs):
          return MyObject.objects.all()
  
      def get_object(self, *args, **kwargs):
          print(self.uuid) // None
  
          print(MyObject.objects.get(uuid=self.uuid)) // None
  
          queryset = self.get_queryset()
          obj = get_object_or_404(queryset, uuid=self.uuid)
          return obj
  </code></pre>
  <p>However, I'm not seeing that the uuid kwarg from <code>path()</code> is not being passed into the class ... that is, <code>self.kwargs</code> is None, and <code>self.uuid</code> is also None.</p>
  <p>How can I get <code>MyCustomGraphQLView</code> to inherit the <code>setup()</code> from <code>from django.views.generic import View</code>?</p>