Update README.md

Author: echarlaix

README.md

@@ -208,8 +208,8 @@ With `export=True`, IPEX model will replace torch linear to ipex linear which pr
 Here is the example of how to use IPEX optimized model to generate texts.
 ### generate
 ```diff
-import torch
-from transformers import AutoTokenizer
+  import torch
+  from transformers import AutoTokenizer, pipeline
 - from transformers import AutoModelForCausalLM
 + from optimum.intel.ipex import IPEXModelForCausalLM