adding change for delete

Author: rajat08

pinecone/core/grpc/index_grpc.py

@@ -268,7 +268,8 @@ def delete(self, *args, async_req=False, **kwargs):
         request = DeleteRequest(*args, **kwargs)
         timeout = kwargs.pop('timeout', None)
         if async_req:
-            return self._wrap_grpc_call(self.stub.Delete.future, request, timeout=timeout)
+            future = self._wrap_grpc_call(self.stub.Delete.future, request, timeout=timeout)
+            return PineconeGrpcFuture(future)
         else:
             return self._wrap_grpc_call(self.stub.Delete, request, timeout=timeout)