Update README

Signed-off-by: shiyu22 <shiyu.chen@zilliz.com>

README.md

@@ -56,7 +56,7 @@ config.collection_name = collection_name
 config.source_type = 'url'
 
 p = AutoPipes.pipeline('eqa-insert', config=config)
-res = p('https://raw.githubusercontent.com/towhee-io/towhee/main/README.md')
+res = p('https://github.com/towhee-io/towhee/blob/main/README.md')
 ```
 
 Then you can run `collection.num_entities` to check the number of the data in Milvus as a knowledge base.