Corrected tool_choice parameter in llama-cpp-python example

README.md

@@ -188,12 +188,12 @@ print(llm.create_chat_completion(
           }
         }
       }],
-      tool_choice=[{
+      tool_choice={
         "type": "function",
         "function": {
           "name": "get_current_weather"
         }
-      }]
+      }
 ))
 ```