fix neo4jstorage bug

README.md

@@ -321,7 +321,7 @@ WORKING_DIR = "./local_neo4jWorkDir"
 rag = LightRAG(
     working_dir=WORKING_DIR,
     llm_model_func=gpt_4o_mini_complete,  # Use gpt_4o_mini_complete LLM model
-    kg="Neo4JStorage", #<-----------override KG default
+    graph_storage="Neo4JStorage", #<-----------override KG default
     log_level="DEBUG"  #<-----------override log_level default
 )
 ```