Update

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

README.md

@@ -10,15 +10,15 @@ This pipeline is used to **extract the feature vector of the image**. First step
 
 **Args:**
 
-- img_tensor(`PIL.Image`), 
+​	img_tensor(`PIL.Image`):
 
-  The image to be encoded.
+​		The image to be encoded.
 
 **Returns:**
 
-- (`Tuple[('cnn', numpy.ndarray)]`)
+​	(`Tuple[('cnn', numpy.ndarray)]`)
 
-  The embedding of the image.
+​		The embedding of the image.
 
 ## How to use