fix order of param (confluentinc#1263, @DLT1412)

The argument order in the constructor signature for AvroDeserializer/Serializer
was altered in v1.6.1, but the example is not changed yet.

Author: DLT1412

examples/avro_consumer.py

@@ -83,8 +83,8 @@ def main(args):
     sr_conf = {'url': args.schema_registry}
     schema_registry_client = SchemaRegistryClient(sr_conf)
 
-    avro_deserializer = AvroDeserializer(schema_str,
-                                         schema_registry_client,
+    avro_deserializer = AvroDeserializer(schema_registry_client,
+                                         schema_str,
                                          dict_to_user)
     string_deserializer = StringDeserializer('utf_8')