modify readme

Signed-off-by: gexy5 <xinyu.ge@zilliz.com>

README.md

@@ -42,7 +42,7 @@ import towhee
 (
     towhee.glob['path']('./archery.mp4')
           .video_decode.ffmpeg['path', 'frames']()
-          .action_classification.omnivore['frames', ('labels', 'scores', 'features')](
+          .action_classification.movinet['frames', ('labels', 'scores', 'features')](
                 model_name='movineta0')
           .select['path', 'labels', 'scores', 'features']()
           .show(formatter={'path': 'video_path'})
@@ -64,7 +64,7 @@ model_name='movineta0', skip_preprocess=False, classmap=None, topk=5)***
 
 ​	***model_name***: *str*
 
-​	The name of pre-trained tsm model.
+​	The name of pre-trained movinet model.
 
 ​    Supported model names:
 - movineta0