Update README.md

Fix typo

Author: Akhil Nair

README.md

@@ -135,7 +135,7 @@ key = {"name": "Key"}
 
 avroProducer = AvroProducer({
     'bootstrap.servers': 'mybroker,mybroker2',
-    'schema.registry.url': 'http://schem_registry_host:port'
+    'schema.registry.url': 'http://schema_registry_host:port'
     }, default_key_schema=key_schema, default_value_schema=value_schema)
 
 avroProducer.produce(topic='my_topic', value=value, key=key)