Updates README.md sample running code to remove FutureWarning deprecation error for `ViTFeatureExtractor`.

README.md

@@ -28,12 +28,12 @@ This is an image captioning model trained by @ydshieh in [flax ](https://github.
 
 ```python
 
-from transformers import VisionEncoderDecoderModel, ViTFeatureExtractor, AutoTokenizer
+from transformers import VisionEncoderDecoderModel, ViTImageProcessor, AutoTokenizer
 import torch
 from PIL import Image
 
 model = VisionEncoderDecoderModel.from_pretrained("nlpconnect/vit-gpt2-image-captioning")
-feature_extractor = ViTFeatureExtractor.from_pretrained("nlpconnect/vit-gpt2-image-captioning")
+feature_extractor = ViTImageProcessor.from_pretrained("nlpconnect/vit-gpt2-image-captioning")
 tokenizer = AutoTokenizer.from_pretrained("nlpconnect/vit-gpt2-image-captioning")
 
 device = torch.device("cuda" if torch.cuda.is_available() else "cpu")