rm dc2 in readme

README.md

@@ -20,7 +20,7 @@ This operator extracts features for video or text with [CLIP4Clip](https://arxiv
 Read the text 'kids feeding and playing with the horse' to generate an text embedding. 
 
 ```python
-from towhee.dc2 import pipe, ops, DataCollection
+from towhee import pipe, ops, DataCollection
 
 p = (
     pipe.input('text') \
@@ -36,7 +36,7 @@ DataCollection(p('kids feeding and playing with the horse')).show()
 Load an video from path './demo_video.mp4' to generate an video embedding. 
 
 ```python
-from towhee.dc2 import pipe, ops, DataCollection
+from towhee import pipe, ops, DataCollection
 
 p = (
     pipe.input('video_path') \