[skip ci] Update Python example code link

Former-commit-id: 369a101beda4041a537b7cdb391f60f1ef237d7a

README.md

@@ -146,7 +146,7 @@ Install Milvus Python SDK.
 $ pip install pymilvus==0.2.3
 ```
 
-Create a new file `example.py`, and add [Python example code](https://github.com/milvus-io/pymilvus/blob/master/examples/advancedexample.py) to it.
+Create a new file `example.py`, and add [Python example code](https://github.com/milvus-io/pymilvus/blob/master/examples/advanced_example.py) to it.
 
 Run the example code.