fix lm_finetuning's link

README.md

@@ -140,7 +140,7 @@ The repository further comprises:
   - [`run_classifier.py`](./examples/run_classifier.py) - Show how to fine-tune an instance of `BertForSequenceClassification` on GLUE's MRPC task,
   - [`run_squad.py`](./examples/run_squad.py) - Show how to fine-tune an instance of `BertForQuestionAnswering` on SQuAD v1.0 and SQuAD v2.0 tasks.
   - [`run_swag.py`](./examples/run_swag.py) - Show how to fine-tune an instance of `BertForMultipleChoice` on Swag task.
-  - [`run_lm_finetuning.py`](./examples/run_lm_finetuning.py) - Show how to fine-tune an instance of `BertForPretraining` on a target text corpus.
+  - [`simple_lm_finetuning.py`](./examples/lm_finetuning/simple_lm_finetuning.py) - Show how to fine-tune an instance of `BertForPretraining` on a target text corpus.
 
 - One example on how to use **OpenAI GPT** (in the [`examples` folder](./examples)):
   - [`run_openai_gpt.py`](./examples/run_openai_gpt.py) - Show how to fine-tune an instance of `OpenGPTDoubleHeadsModel` on the RocStories task.