Update README

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

README.md

@@ -44,6 +44,7 @@ import towhee
           .audio_decode.ffmpeg['path', 'frames']()
           .runas_op['frames', 'frames'](func=lambda x:[y[0] for y in x])
           .audio_embedding.data2vec['frames', 'vecs'](model_name="facebook/data2vec-audio-base-960h")
+          .select['path', 'vecs']()
           .show()
 )
 ```
@@ -96,6 +97,3 @@ An audio embedding operator generates vectors in numpy.ndarray given an audio fi
 **Returns:** *numpy.ndarray*
 
 ​   The audio embedding extracted by model.
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